Simon Mcclusky

• Fellow at Australian National University

Plain Language Summary A fault's earthquake potential is closely related to the coupling (or “locking”) coefficient, quantifying how much relative plate movement is not accommodated by fault creep. The coupling of faults bounding the tectonic blocks in Java‐Timor subduction‐collision zone has not been well investigated. Most previous models for thi...

In 2018, four deadly (Mw 6.2–6.9) earthquakes struck the north coast of Lombok Island on 28 July, 5 August, and 19 August. The slip distributions of the three mainshocks are modeled in this study by inverting the co-seismic deformation imaged using an interferometric analysis of Sentinel-1 synthetic aperture radar measurements (InSAR), based on rec...

Multiple passages of the atmospheric (Lamb) waves were recorded globally after the Hunga Tonga‐Hunga Ha'apai (HTHH) volcanic eruption on 15 January 2022. The waves perturbed the ionosphere and produced traveling ionospheric disturbances (TIDs) that were observed from the ground network of Global Positioning System (GPS) receivers. This study presen...

Global Positioning System (GPS) deformation measurements were combined with groundwater level data to examine the spatiotemporal variability of groundwater storage in the Lachlan catchment located in central New South Wales (Australia). After correcting for effects of glacial isostatic adjustment, non‐tidal oceanic and atmospheric loading as well a...

Pairing navigation satellites and CubeSats could provide earlier, more accurate warnings of approaching tsunamis and other impacts of extreme events.

Gravitational potential data from GRACE are being used to study mass redistribution within and between the atmosphere, hydrosphere, cryosphere, and solid Earth. The GRACE data are made available in a reference frame with its origin at the center of mass of the Earth system (geocenter) while many other geophysical models and data sets refer to a ref...

In this paper we describe the earthquake geology of East Japan, based on a seismotectonic analysis of foreshocks and aftershocks for the 2011 Tohoku-oki Great Earthquake. The earthquake geology is defined by three compressional buttresses that are separated by channels dominated by extensional earthquakes. In the 2011 earthquake sequence, most acti...

The mechanical interaction between rocks at fault zones is a key element for understanding how earthquakes nucleate and propagate. Therefore, estimating frictional properties along fault planes allows us to infer the degree of elastic strain accumulation throughout the seismic cycle. The Java subduction zone is an active plate boundary where high s...

Following a sequence of three Slow Slip Events (SSEs) on the northern Hikurangi Margin, between June 2015 and August 2016, a Mw 7.1 earthquake struck ~30 km offshore of the East Cape region in the North Island of New Zealand on the 2nd September 2016 (NZ local time). The earthquake was also followed by a transient deformation event (SSE or aftersli...

Improper modeling of horizontal tropospheric gradients in GPS analysis induces errors in estimated parameters, with the largest impact on heights and tropospheric zenith delays. The conventional two-axis tilted plane model of horizontal gradients fails to provide an accurate representation of tropospheric gradients under weather conditions with asy...

Our understanding of seismic risk in Java has been focused primarily on the subduction zone, where the seismic records during the last century have shown the occurrence of a number of tsunami earthquakes. However, the potential of the existence of active crustal structures within the island of Java itself is less well known. Historical archives sho...

Invited Lecture on Offset estimation in GPS time series

We present the results of a new numerical model of the late glacial western Laurentide Ice Sheet, constrained by observations of glacial isostatic adjustment (GIA), including relative sea level indicators, uplift rates from permanent GPS stations, contemporary differential lake level change, and postglacial tilt of glacial lake level indicators. Th...

We use Global Positioning System (GPS) measurements of surface deformation to show that the convergence between the Australian Plate and Sunda Block in eastern Indonesia is partitioned between the megathrust and a continuous zone of back-arc thrusting extending 2000km from east Java to north of Timor. Although deformation in this back-arc region ha...

New Guinea is a region characterized by rapid oblique convergence between the Pacific and Australian tectonic plates. The detailed tectonics of the region, including the partitioning of relative block motions and fault slip rates within this complex boundary plate boundary zone are still not well understood. In this study, we quantify the distribut...

We use geodetic, plate tectonic, and geologic observations to quantitatively reconstruct the geologic evolution of the Red Sea and Gulf of Aden since separation of Arabia from Africa in the Late Oligocene. Rifting initiated at 22 ± 3 Ma roughly simultaneously along the full strike of the proto-Red Sea and Gulf of Aden. Rifting began along pre-exist...

The Indonesian archipelago encompasses a wide range of tectonic environments, including island arc volcanism, subduction zones, and arc-continent collision. Many of the details of this tectonic activity are still poorly understood, especially where the Australian continent collides with Indonesia, separating the Sunda Arc in west from that at the B...

Extracting geophysical signals from GPS coordinate time series is a well-established practice that has led to great insights into how the Earth deforms. Often small discontinuities are found in such time series and are traceable to either broad-scale deformation (i.e. earthquakes) or discontinuities due to equipment changes and/or failures. Estimat...

During the past century, a series of predominantly westward migrating M > 7 earthquakes broke an ~1000 km section of the North Anatolian Fault (NAF). The only major remaining “seismic gap” along the fault is under the Sea of Marmara (Main Marmara fault [MMF]). We use 20 years of GPS observations to estimate strain accumulation on fault segments in...

Continuous global positioning system (GPS) stations propagate biases and spurious signals into the derived parameter time series when the measurements are subject to site-specific effects, such as multipath. This is a particular problem in the investigation of geophysical and atmospheric phenomena where signals may be small in magnitude. A methodol...

[1] Systematic analysis of earthquake focal solutions derived from centroid moment tensors shows well-defined orientation groups in scatter plots of fault plane normals and associated slip line vectors. Consideration of the geometry implied by these orientation groups can allow resolution of the ambiguity inherent in the choice as to which of the t...

The GRACE products used by many scientists to study mass changes on and within the surface of the Earth are typically in the form of spherical harmonics. We have developed new software that processes the Level-1B data of the GRACE mission to derive estimates of mass changes using the 'mascons' (mass concentration) approach. We have taken a fresh lo...

We use survey and continuous GPS observations during the period 1997–2010 to investigate active deformation in the Isparta Angle region of SW Anatolia, Turkey. This region, bordered by the Fethiye Burdur Fault Zone (FBFZ) in thewest and the SE extension of the Aksehir Simav Fault Zone (AKSFZ) in the east, accommodates a part of the active deformati...

In the analysis of some specific time series (e.g., Global Positioning System coordinate time series, chaotic time series, human brain imaging), the noise is generally modeled as a sum of a power-law noise and white noise. Some existing softwares estimate the amplitude of the noise components using convex optimization (e.g., Levenberg-Marquadt) app...

In the analysis of some specific time series (e.g., Global Positioning System coordinate time series, chaotic time series, human brain imaging), the noise is generally modeled as a sum of a power-law noise and white noise. Some existing softwares estimate the amplitude of the noise components using convex optimization (e.g., Levenberg-Marquadt) app...

[1] The 21st Century has seen the occurrence of 17 great earthquakes (Mw >8), including some of the largest earthquakes ever recorded. Numerical modeling of the earthquakes shows that nearly half of the Earth's surface has undergone horizontal coseismic deformation >1 mm, with the 2004 Sumatra-Andaman earthquake dominating the global deformation fi...

Groundwater management in Australia is complicated by the cost and scarcity (vs. spatial variability) of bore monitoring. Gravity Recovery and Climate Experiment (GRACE) remote sensing may alleviate this problem, but derived groundwater storage estimates are subject to errors, particularly, in total water storage (TWS) retrieval and in estimated so...

GRACE spherical harmonic coefficients are typically limited to degree and order 50 or 60. This means that the spatial resolution of geophysical estimates from GRACE gravity field are limited by truncation errors and leakage of signals from, for example, oceans to continents or from one glacier to another. This results in estimates of local mass bal...

Coseimic offset is an important parameter in the study of any earthquake, because that allows to observe directly the magnitude of the nominated event at the location of the GPS stations. At a larger scale, the validation of the dislocation theory of spherically symmetric models is investigated through the study of post-seismic displacements. But d...

For well over a decade GPS time series have been used as an effective way of densifying a reference frame. During this period numerous advances have been made in the analysis and modelling techniques applied to GPS observations. This has seen GPS time series improve by almost an order of magnitude in accuracy, and has allowed even more challenging...

Between August 2010 and February 2011 the strongest La Niña event seen since 1973 fuelled widespread above average rainfall and flooding across much of north and eastern Australia. Rainfall for August to December was the highest on record across vast areas of eastern Australia, particularly in Queensland and northern Victoria. Many monthly rainfall...

GPS observations along three profiles across the Ethiopian Rift and Afar triple junction record differences in the length scale over which extension is accommodated. In the Afar region, where the mantle lithosphere is nearly or entirely absent, measurable extension occurs over ˜175 km; in the northern Ethiopian Rift, where the mantle lithosphere is...

The Gravity Recovery and Climate Experiment space gravity mission provides one of the principal means of estimating present-day mass loss occurring in polar regions. Extraction of the mass loss signal from the observed gravity changes is complicated by the need to first remove the signal of ongoing glacial isostatic adjustment (GIA) since the Last...

We use geodetic and plate tectonic observations to constrain the tectonic evolution of the Nubia-Arabia-Eurasia plate system. Two phases of slowing of Nubia-Eurasia convergence, each of which resulted in an ˜50 per cent decrease in the rate of convergence, coincided with the initiation of Nubia-Arabia continental rifting along the Red Sea and Somal...

We use velocities from 65 continuous stations and 31 survey-mode GPS sites as well as kinematic modeling to investigate present day deformation along the Africa–Iberia plate boundary zone in the western Mediterranean region. The GPS velocity field shows southwestward motion of the central part of the Rif Mountains in northern Morocco with respect t...

Geodetic and plate tectonic observations indicate that the rate of Africa (AF) - Eurasia (EU) convergence slowed by ~50% at 24 +/- 4 Ma when AF began to separate from Arabia (AR) initiating extension along the Red Sea and Gulf of Aden. A further ~50% slowing of AF-EU convergence occurred at 11+/- 2 Ma when extension in the Gulf of Aden evolved to f...

Over the last twenty-five years an increasing number of discrete GNSS networks have been installed across the globe for a variety of purposes. These networks have been built with specific scientific or civil goals in mind such as; monitoring atmospheric or ionospheric properties, definition of terrestrial or cadastral reference frames, monitoring o...

We use data from 31 survey-mode Global Positioning System (GPS) measurements in Morocco from 1999 to 2006 (Fadil et al. 2006) and 65 continuous GPS stations extending from Morocco to south of Spain to derive an improved velocity field for the western Mediterranean. Velocities from 42 new stations confirm the earlier results of Fadil et al. showing...

GPS observations are sensitive to a wide range of atmospheric, oceanic, hydrologic and solid-Earth processes. Estimating the accuracy of GPS coordinate time series is therefore problematic because it is virtually impossible to know what the “true” answer is since none of these components of the Earth system are fully understood. Traditionally, stat...

The Australian Plate has been considered to be rigid at the 0.7 - 2 mm/yr level by studies using space geodetic techniques. However, three Great earthquakes have occurred around the Australian Plate in the past decade: the Sumatra-Andaman and Macquarie Island earthquakes in 2004 and the Solomon Islands earthquake in 2007- that have deformed the Aus...

A new set of geodetic velocities for Greece and the Aegean, derived from 254 survey-mode and continuous GPS sites, is used to test kinematic and dynamic models for this area of rapid continental deformation. Modeling the kinematics of the Aegean by the rotation of a small number (3–6) of blocks produces RMS misfits of ~5 mm yr−1 in the southern Aeg...

We present the results of dynamic modeling of the western Mediterranean that accounts for observed global positioning system (GPS) surface deformation of the Alboran Sea and surrounding Rif and Betic Mountains as the result of the combined effects of relative motion of the Eurasian and Nubian plates, low strength in the Alboran Sea region and sub-l...

We present evidence that GPS velocity estimates of plate motions and fault slip rates agree to within uncertainties with geologic estimates during the most recent phase of the geologic evolution of the E Mediterranean region (post-Late Miocene). On this basis, we use the GPS differential velocities to estimate the timing of initiation of the princi...

Five years of continuously recording GPS observations in the Kingdom of Saudi Arabia together with new continuous and survey-mode GPS observations broadly distributed across the Arabian Peninsula provide the basis for substantially improved estimates of present-day motion and internal deformation of the Arabian plate. We derive the following relati...

We present GPS observations in Morocco and adjacent areas of Spain from 15 continuous (CGPS) and 31 survey-mode (SGPS) sites extending from the stable part of the Nubian plate to central Spain. We determine a robust velocity field for the W Mediterranean that we use to constrain models for the Iberia-Nubia plate boundary. South of the High Atlas Mo...

1] GPS measurements adjacent to the southern Red Sea and Afar Triple Junction, indicate that the Red Sea Rift bifurcates south of 17° N latitude with one branch following a continuation of the main Red Sea Rift (∼150° Az.) and the other oriented more NS, traversing the Danakil Depression. These two rift branches account for the full Arabia–Nubia re...

New Global Positioning System (GPS) measurements in NW Syria provide the first direct observations of near-field deformation associated with the northern Dead Sea fault system (DSFS) and demonstrate that the kinematics of the northern section of this transform plate boundary between the Arabian and Sinai plates deviate significantly from plate mode...

Geodetic observations within and adjacent to the Arabia-Eurasia continental collision zone provide precise (± < 1mm/yr) estimates of the distribution of present-day deformation on scales from 10 km (across the most active structures) to 1000+ km (encompassing the entire collision zone). Comparisons of geodetic and geologic estimates of fault slip r...

This study presents an initial synthesis of GPS observations focusing on different parts of the Dead Sea Fault System (DSFS) in order to construct a comprehensive view of crustal deformation along the entire length of this left-lateral, transform boundary between the Arabian and Sinai plates. As one of the main tectonic elements in the eastern Medi...

We present a geodynamic scenario for the evolution of the Nubia (Nu)-Arabia (Ar)-Somalia (So) plate boundary system that is based on new geodetic constraints on the kinematics of active deformation, and published estimates of the timing of regional tectonic processes. This scenario supports two, long debated, principal hypotheses for plate dynamics...

1] We have modeled postseismic deformation from 1999 to 2003 in the region surrounding the 1999 Izmit and Düzce earthquake ruptures, using a three-dimensional viscoelastic finite element method. Our models confirm earlier findings that surface deformation within the first few months of the Izmit earthquake is principally due to stable frictional af...

We report the results of nearly 7 years of postseismic deformation measurements using continuously recorded and survey mode GPS observations for the 1999 Izmit-Düzce earthquake sequence. Resolvable, time-dependent postseismic changes to the preearthquake interseismic velocity field extend at least as far as the continuous GPS station in Ankara, ∼20...

GPS measurements adjacent to the southern Red Sea and around the Afar Triple Junction (Red Sea Rift-Gulf of Aden Rift-East African Rift), indicate that the Red Sea rift bifurcates south of 16° N latitude with one branch following a continuation of the main Red Sea rift (~150° Azimuth) and the other oriented roughly N-S traversing the Danakil Depres...

The magnitude Mw = 6.3 earthquake in Al Hoceima, Morocco of 24 February, 2004 occurred in the active plate boundary accommodating the oblique convergence between Africa and Eurasia. Three different sets of estimates of its source parameters have already been published. We try to resolve the discrepancies between them by using additional data includ...

Geodetically-derived motions for Arabia and Nubia relative to Eurasia agree within 1 standard deviation with plate rates estimated from geologic observations (McQuarrie et al., GRL, 2003) for the past 11 Myr for Nubia and greater than 25 Myr for Arabia. Furthermore, fault slip rates derived from an elastic block model constrained by GPS agree withi...

Restraining bends along strike-slip faults are typically characterized by relative structural and kinematic complexity, owing to the obliquity of plate motion with respect to the structural trend. One example of a large restraining bend is the Lebanese Restraining Bend (LRB), a ~180 km long bend in the left-lateral Dead Sea Transform System. Compar...

Over the last decade, GPS measurements in Iran, Azerbaijan, and adjacent regions have provided a direct quantification of the displacements of the earth surface in that region of the Arabia-Eurasia collision zone. We present an up to date velocity field in the southern Caspian region of the collision zone. A striking feature of the velocity field i...

GPS velocities and seismicity across the Betic–Rif Arc structural domains (Morocco and Iberia) provide a basis to evaluate present-day seismotectonic processes between different deformation belts. The results show asymmetric movements in the complex Alboran system accommodating the convergence between the African (Nubian) and Eurasian plates. While...

Global Positioning System (GPS) observations in Azerbaijan and surrounding areas of the Caucasus region are providing quantitative constraints of the geometry of active fault systems, and rates of pre- sent-day deformation. West of 48° E longitude, the Main Caucasus Trust Fault (MCT) follows the sharp change in slope along the south side of the Gre...

GPS velocities and seismicity across the Betic-Rif Arc structural domains (Morocco and Iberia) provide a basis to evaluate present-day seismotectonic processes between different deformation belts. The results show asymmetric movements in the complex Alboran system accommodating the convergence between the African (Nubian) and Eurasian plates. While...

The Plate Boundary Observatory is being installed along the Pacific-North America plate boundary and when complete will add 875 new GPS sites and incorporate 209 existing GPS sites into the network. The GPS phase data from all these sites and an additional 40 sites to tie to the North America plate are analyzed by PBO analysis centers (ACs) at the...

Approximately 4 yr of campaign and continuous Global Positioning System (GPS) measurements across the Dead Sea fault system (DSFS) in Lebanon provide direct measurements of interseismic strain accumulation along a 200-km-long restraining bend in this continental transform fault. Late Cenozoic transpression within this restraining bend has maintaine...

The 1991, Ms = 7.0 Racha earthquake is the largest ever recorded in the Caucasus Mountains. Approxi-mately three months after this thrust-faulting earth-quake, a GPS network was set up to measure postseis-mic surface deformation. We present an analysis of these data, which indicate accelerated postseismic motions at several near-field sites. We mod...

SUMMARY Approximately 4 yr of campaign and continuous Global Positioning System (GPS) measurements across the Dead Sea fault system (DSFS) in Lebanon provide direct measurements of interseismic strain accumulation along a 200-km-long restraining bend in this continental transform fault. Late Cenozoic transpression within this restraining bend has m...

We are using the Global Positioning System (GPS) to monitor and quantify patterns and rates of tectonic and magmatic deformation associated with active rifting of the continental lithosphere and the transition to sea floor spreading in the Red Sea. Broad-scale motions of the Nubian and Arabian plates indicate coherent plate motion with internal def...

The first GPS site in the Plate Boundary Observatory (PBO) component of the National Science Foundation's Earthscope project was installed in January 2004. As of September 2006, 411 PBO GPS sites have been installed with 50 of these sites located on or near active volcanoes around the plate boundary. In addition to these new sites, 209 pre-existing...

Since the August 17, 1999 Izmit, Turkey earthquake, a network of over 50 GPS sites in the area has been measuring postseismic deformation of the surrounding region. We present the results of a new analysis of data from this GPS network, from August 17, 1999 to mid-2006. At each GPS site, time-dependent position data are fit to functions comprising...

We often explain rapid postseismic deformation following large earthquakes in terms of rapid afterslip, followed by relaxation of viscoelastic mantle and/or lower crust with a modest effective viscosity. In the case of the North Anatolian Fault Zone (NAFZ), however, the lithosphere that yields such deformation must also produce interseismic deforma...

We present the results of 17 years of GPS monitoring in this zone of plate interaction and show that to the resolution of our observations (i.e., ~1-2 mm/yr; ~ ±10 % of relative plate motions), deformation is consistent with plate-block models with relative motion between adjacent plates/blocks accommodated by elastic strain accumulation. Relative...

Surface deformation in Morocco, derived from five years of global positioning system (GPS) survey observations of a 22-station network, four continuously recording GPS (CGPS) stations, and four International GNSS Service (IGS) stations in Iberia, indicates roughly southward motion (˜3 mm/yr) of the Rif Mountains, Morocco, relative to stable Africa....

We Present a GPS-derived velocity field 1988-2005 for the zone of interaction of the Arabian African Nubian and Somalian and Eurasian plates The Velocity field indicates counterclockwise motion of a broad area of the Earth s surface that includes the Arabian plate adjacent parts of the Zagros and Central Iran Turkey and the Aegean at rates in the r...

The Main Ethiopian Rift (MER) in central Ethiopia extended in the rift-normal direction at a mean rate of 4.0 ± 0.9 mm yr−1 (1σ) during the period 1992–2003, nearly a factor of two slower than the opening rate estimated from global plate motion inversions. Rift opening near a geodetic array during this period was accommodated by a single dike injec...

Lebanon and southwestern Syria comprise a prominent, 200-km long restraining bend along the Dead Sea fault system (DSFS) - the continental transform boundary between the Arabian and Sinai plates. Within this "Lebanese Restraining Bend", the DSFS splays into several prominent, left-lateral strike-slip faults, in addition to uplift owing to regional...

The Plate Boundary Observatory GPS data analysis centers (ACs) at the Berkeley Seismological Laboratory (BSL) and Central Washington University (CWU), and the analysis center coordinator (ACC) at the Massachusetts Institute of Technology began establishing the GPS processing centers on April 1, 2005. The PBO GPS data analyses will be operational on...

The location and character of the Africa-Eurasia plate boundary in the western Mediterranean remain equivocal. Miocene to present extension of the interplate Alboran domain occurs within the context of ongoing Africa-Eurasia convergence. Ideas to explain the apparently synchronous subsidence of the Alboran Sea and uplift of the adjacent Betic and R...

GPS survey sites in the Sinai Peninsula show northerly motion relative to Africa (Nubia) at 1.4 ± 0.8 mm/yr north and 0.4 ± 0.8 mm/yr west. Continuous IGS GPS sites in Israel, west of the Dead Sea fault show a similar northerly sense of motion relative to Nubia (2.4 ± 0.6 mm/yr north and 0.04 ± 0.7 mm/yr east), suggesting that the entire Sinai Bloc...

The Dead Sea fault system (DSFS) is the transform plate boundary between the Arabian and Sinai plates in the eastern Mediterranean region. Along part of the northern DSFS in northwestern Syria, paleoseismic and historical studies document repeated large earthquakes over the past 2000 years, although the region has not experienced a large (magnitude...

Kinematic inversions of GPS velocity data from the first four years after the Izmit-Düzce earthquake sequence indicate that most postseismic slip has occured below two high coseismic slip patches, separated by a central coseismic slip patch that extends to a depth of at least 22 km. Integrated over four years, up to 2.5 meters of afterslip has occu...

We seek to measure interseismic deformation across the fault systems intersecting at the Karlova Triple Junction using radar interferometry at C-band (~5 cm) wavelengths. We have obtained ERS interferograms with enough correlated pixels to interpret for pairs spanning up to 3 years, provided that the images are both acquired in the summer months (J...

We use continuously recording GPS (CGPS) and survey-mode GPS (SGPS) observations to determine Euler vectors for relative motion of the African (Nubian), Arabian and Eurasian plates. We present a well-constrained Eurasia-Nubia Euler vector derived from 23 IGS sites in Europe and four CGPS and three SGPS sites on the Nubian Plate (-0.95 +- 4.8N, -21....

The 1999 Izmit (M=7.5) and Duzce (M=7.1) earthquake sequence on the western North Anatolian fault is providing a wealth of information on the mechanics of strike-slip faulting, the physical nature of the earthquake deformation cycle, and the rheology of the lower crust/upper mantle in NW Turkey. The earthquakes occurred within a seismic gap that wa...

(Presented on behalf of the E. Med/Caucasus GPS Consortium). We use GPS observations during the period 1988 to 2004 to constrain an elastic block model for deformation within the zone of interaction of the Eurasian, African, and Arabian plates. We constrain present-day motions of the African (Nubian), Arabian, and Eurasian plates, regional deformat...

We use four geodetic satellite systems (Global Positioning System [GPS], European Remote Sensing [ERS], RADARSAT, and Satellite Pour l'Observation de la Terre [SPOT]) to measure the permanent deformation field produced by the I zmit earthquake of 17 August 1999. We emphasize measurements from interferometric analysis of synthetic aperture radar (SA...

We use four geodetic satellite systems (Global Positioning System [GPS], European Remote Sensing [ERS], RADARSAT, and Satellite Pour l'Observation de la Terre [SPOT]) to measure the permanent deformation field pro-duced by the I ˙ zmit earthquake of 17 August 1999. We emphasize measurements from interferometric analysis of synthetic aperture radar...

Only 87 days after the M w 7.5, 17 August 1999 I ˙ zmit earthquake, the Düzce earthquake ruptured a ca. 40-km-long adjoining strand of the North Anatolian fault (NAF) system to the east. We used displacements of 50 Global Positioning System (GPS) sites together with interferometric synthetic aperture radar (InSAR) range-change data spanning the eve...

We model the geodetically observed secular velocity field in northwestern Turkey with a block model that accounts for recoverable elastic-strain accumulation. The block model allows us to estimate internally consistent fault slip rates and locking depths. The northern strand of the North Anatolian fault zone (NAFZ) carries approximately four times...

Surface deformation transients measured with the Global Positioning System during the 87 days between the 17 August 1999 İzmit earthquake and the 12 November 1999 Düzce earthquake indicate rapidly decaying aseismic fault slip on and well below the coseismic rupture. Elastic model inversions for time-dependent distributed fault slip, using a network...

We present and interpret the results of postseismic, Global Positioning System monitoring of the first 298 days following the 17 August 1999 İzmit earthquake. Whereas the data suggest some spatial and temporal complexity in the postseismic motions, the overall pattern can be characterized by time-dependent relaxation functions and suggests exponent...

We initiated GPS observations in Morocco during 1999 with the installation (May) and observation (October) of a 23-station network distributed throughout most of the country and extending from the Anti Atlas in central Morocco to the Rif Mountains along the Mediterranean coast. With UNAVCO assistance, we installed continuously recording, on-line GP...

Over the past decade, rapid ground deformation has been measured over the Coso geothermal field in Eastern CA using InSAR and GPS. InSAR resolves changes in distance along the line-of-sight (LOS) to the satellite with high spatial coverage. In the Coso geothermal field the maximum LOS displacements are up to 35 mm/yr. The inclination of the LOS is...