Alessandro Verdecchia

Alessandro Verdecchia
Ruhr-Universität Bochum | RUB · Institute of Geology, Geophysics and Mineralogy

Dr. rer. nat.

About

27
Publications
3,526
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165
Citations

Publications

Publications (27)
Article
The region north of the Garlock fault between the Sierra Nevada and Death Valley has experienced at least eight Mw ≥ 6 earthquakes in historical times, beginning with the 1872, Mw 7.5, Owens Valley earthquake. Furthermore, since 1978, the Long Valley caldera has been undergoing periods of unrest, with earthquake swarms and resurgence. Our goal is t...
Preprint
Full-text available
Intraplate tectonic stress fields are complex due to the imprint of a long geological history. Here we use a new dataset of earthquake focal mechanism solutions and relocated events to investigate the relationship between regional stress, crustal strength, and seismicity in the Charlevoix Seismic Zone (CSZ), the most active seismic zone in eastern...
Article
Full-text available
The static stress drop of an earthquake is an indicator of the stress state of a specific fault before rupture initiation. The stress state is primarily controlled by the ambient stress field, fault strength, fault complexity, and the presence of fluids. This study aims to investigate the spatio‐temporal distribution of static stress drop values of...
Article
Full-text available
A multi-proxy field and laboratory study was conducted to investigate the impact of a regional fault zone on Devonian carbonate geothermal reservoir properties. The outcrop analogue chosen is exposed in the Steltenberg quarry (North Rhine-Westphalia, Germany) and provides access to Devonian lime- and dolostone units affected by branches of the Enne...
Article
Full-text available
An increase in injection activity associated with energy production in southern Kansas starting in 2013 has been linked to the occurrence of more than 130,000 earthquakes (M ‐1.5 to 4.9) between 2014 and 2017. Studies suggest that the dramatic increase in seismicity rate is related to wastewater injection into the highly permeable Arbuckle formatio...
Article
The Mw 4.6 earthquake that occurred on 17 August 2015 northwest of Fort St. John, British Columbia, is considered the largest hydraulic-fracturing-induced event in Canada, based on its spatiotemporal relationship with respect to nearby injection operations. There is a ∼5 day delay of this Mw 4.6 mainshock from the onset of fluid injection at the cl...
Article
Full-text available
Plain Language Summary Seismicity linked to hydraulic fracturing (HF) in shale gas exploration in western Canada has increased drastically over the last decade. However, details of induced seismicity sequence evolution and triggering mechanism(s) remain unclear. In this study, we integrate local seismic monitoring and numerical stress modeling for...
Article
The number of earthquakes in the western Canada sedimentary basin (WCSB) has increased drastically in the last decade related to unconventional energy production. The majority of reported earthquakes are correlated spatially and temporally with hydraulic fracturing (HF) well stimulation. In this study, we use waveform data from a new deployment of...
Article
Full-text available
Megathrust roughness and structural complexity are thought to be controls on earthquake slip at subduction zones because they result in heterogeneity in shear strength and resolved stress. However, because active megathrust faults are difficult to observe, the causes and scales of complexity are largely unknown. Here we measured the in situ propert...
Article
Full-text available
Static and quasi-static Coulomb stress changes produced by large earthquakes can modify the probability of occurrence of subsequent events on neighboring faults. This approach is based on physical (Coulomb stress changes) and statistical (probability calculations) models, which are influenced by the quality and quantity of data available in the stu...
Preprint
Full-text available
Static and quasi-static Coulomb stress changes produced by large earthquakes can modify the probability of occurrence of subsequent events on neighboring faults. This approach is based on physical (Coulomb stress changes) and statistical (probability calculations) models, which are influenced by the quality and quantity of data available in the stu...
Article
Central Italy is characterized by a network of active faults that interact in a complex manner. Coseismic Coulomb stress changes have been invoked by several authors to explain the concentration of moderate-to-strong earthquakes in this region, but none has considered the time-dependent viscoelastic relaxation of the lower crust and upper mantle as...
Article
Diffuse plate boundaries are characterized by deformation distributed over a wide area in a complex network of active faults, and by relatively low strain rates. These characteristics make it difficult to understand the spatial and temporal distribution of seismicity. The area east of the Sierra Nevada, between longitudes 121° W and 116° W, is part...
Thesis
Full-text available
Diffuse plate boundaries are characterized by deformation distributed over a wide area in a complex network of active faults, and by low strain rates. These characteristics make it difficult to understand the spatial and temporal distribution of seismicity. The northern Basin and Range Province (BRP) in the western United States is an excellent exa...
Conference Paper
Full-text available
Static and quasi-static Coulomb stress changes produced by large earthquakes can modify the probability of occurrence of subsequent events on neighbouring faults. In order to better understand and minimize the uncertainties in this kind of approach based on physical (Coulomb stress changes) and statistical (probability calculations) models, we focu...
Article
The Gulf of California, Mexico accommodates ~90% of North America – Pacific plate relative motion. While most of this motion occurs on marine transform faults and spreading centers, several fault segments in the central Gulf come close to peninsular Baja California. Here we present Global Positioning System (GPS) and Interferometric SAR (InSAR) dat...
Article
The region north of the Garlock fault between the Sierra Nevada and Death Valley has experienced at least eight Mw ≥ 6 earthquakes in historical times, beginning with the 1872, Mw 7.5, Owens Valley earthquake. Furthermore, since 1978, the Long Valley caldera has been undergoing periods of unrest, with earthquake swarms and resurgence. Our goal is t...
Conference Paper
Full-text available
The temporal and spatial correlation among earthquakes in diffuse plate boundary zones is not well understood yet. The region north of the Garlock fault between the Sierra Nevada and Death Valley is part of a diffuse plate boundary zone, which absorbs a significant fraction of the plate motion between Pacific and North America. This area has experi...
Conference Paper
Diffuse plate boundary regions are characterized by high deformation rates distributed over a wide zone. The correlation of seismic activity between faults in these regions is not yet well understood. The region between eastern California and western Nevada is part of such a diffuse plate boundary. The purpose of our work is to determine how faults...
Article
Diffuse plate boundary regions are characterized by a high rate of deformation, but distributed over a wider zone when compared to plate boundary faults like the San Andreas and the North Anatolian faults. In diffuse plate boundaries the space-time relationship between activity on specific faults and the location of previous and subsequent events i...
Conference Paper
Full-text available
Diffuse plate boundary regions are characterized by a high rate of deformation, but distributed over a wider zone when compared to plate boundary faults like the San Andreas and the North Anatolian faults. In diffuse plate boundaries the space–time relationship between activity on specific faults and the location of previous and sub-sequent events...

Questions

Questions (2)
Question
I have noticed that often bedding planes are not included in discrete fracture network (DFN) for carbonate rocks. Personally I believe that bedding can be an important anisotropy for fluid flow, and theoretically should be added together with the different fracture sets in a DFN. What's the general opinion in the DFN modeling world?

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