Dimitrios Giannopoulos

Hellenic Mediterranean University · Department of Natural Resources and Environment

On 2010 January 18 and 22, two earthquakes of Mw 5.3 and 5.2, respectively, occurred near the town of Efpalio on the western Gulf of Corinth. We performed a shear wave splitting analysis using the cross-correlation method and calculated Vp/Vs ratios for events that occurred in the epicentral area of the Efpalio earthquakes, between 2009 January and...

Three years of continuous waveform data recorded at 22 stations from the Corinth Rift Laboratory and the Hellenic Unified Seismological Network are used to perform an ambient noise surface-wave tomography of the western Corinth Rift. All available vertical component time-series were cross-correlated to extract empirical Rayleigh-wave Green's functi...

This study performs a reanalysis of the seismicity recorded during the 1996 Gjálp eruption that occurred at NW Vatnajökull, Iceland. The seismicity was recorded by the temporary HOTSPOT network consisting of 30 three-component broadband stations. In total 301 events were identified between 29 September and 12 October and their phases were manually...

Human activity causes vibrations that propagate into the ground as high-frequency seismic waves. Measures to mitigate the COVID-19 pandemic caused widespread changes in human activity, leading to a months-long reduction in seismic noise of up to 50%. The 2020 seismic noise quiet period is the longest and most prominent global anthropogenic seismic...

In this paper, we propose a two–step procedure for the automated detection of micro-earthquakes, using single-station, three-component passive seismic data. The first step consists of the computation of an appropriate characteristic function, along with an energy-based thresholding scheme, in order to attain an initial discrimination of the seismic...

The pandemic of COVID-19 and the global policy implemented to attenuate the spread of the virus, provided a unique opportunity to study the footprint of the resulting social impact of COVID-19 pandemic on seismic data. In this study, a non-extensive statistical physics approach is examined for anthropogenic high-frequency seismic noise in view of C...

Algorithms that deal with the automatic P-and S-onset time identification problem are a topic of ongoing research. Modern dense seismic networks used for earthquake location, focal mechanism determination, seismic tomography investigations, source studies, early warning, etc., demand accurate automatic arrival time estimations of compressional and...

In the context of a passive seismic survey that was launched in the South Lokichar Basin, southwest of Lake Turkana, in Kenya, a seismic network consisting of 13 3-component broadband stations was deployed in the area. In this study, records of both ambient seismic noise and natural seismicity are jointly exploited, through ambient noise tomography...

Methodologies dealing with the detection of micro-earthquakes and the accurate estimation of body waves' arrival time constitute, during the last decades, a topic of ongoing research. The extraction and efficient analysis of the useful information from the continuous recordings is of great importance, since it is a prerequisite for reliable interpr...

Poster presentation of the study titled "The MAUPASACQ experiment: Preliminary results of a noise-based Rayleigh-wave analysis of the Mauleon Basin in western Pyrenees, France", communicated during the European Geosciences Union General Assembly 2019, Vienna, Austria.

In the framework of the MAUPASACQ project, a dense seismic network of 440 three-component stations was deployed throughout the Mauleon Basin, in the northern foothills of the Pyrenees, SW France. The network consisted of three different types of sensors, namely 190 SG-10 SERCEL geophone nodes, 197 5 Hz SEISMOTECH short-period sensors and 53 broadba...

The problem of seismic events extraction from the raw data constitutes one of the most important and vital tasks addressed in geosciences, since its solution plays a crucial role in events location, focal mechanism determination, early warning to name a few. Moreover, small-magnitude seismic events, either natural or induced microearthquakes, have...

On June 8, 2008, a Mw 6.4 earthquake occurred on a strike-slip fault in northwest Peloponnese, Greece, 35 km southwest of the city of Patras. We analysed part of the aftershock sequence of the 2008 earthquake, recorded by a portable network of six stations and a permanent station of the Hellenic Unified Seismological Network, in order to perform a...

On April 2007, an earthquake swarm occurred in the vicinity of Trichonis Lake, western Greece. The seismic activity started on April 10th, 2007 after the occurrence of three moderate size earthquakes Mw 5.0-5.2. We performed shear wave splitting measurements on seismic events recorded during the first week of the seismic activity by a portable netw...

The Corinth Rift separates Peloponnesus to the south from mainland Greece to the north. It is one of the most active extensional intra-continental rifts in the world, with geodetically measured rates of extension varying from ∼5 mm/yr at the eastern part to ∼15 mm/yr at the western part. This work presents a first attempt to study the crustal veloc...

We present preliminary results of an ambient seismic noise analysis performed in the western Corinth Gulf, Greece. The Corinth Gulf is a continental rift which separates the central Greek mainland from Peloponnese. The rift is approximately 120 km long and 10-20 km wide, with a WNW-ESE orientation, extending from the Gulf of Patras in the west, to...

The Corinth Gulf is often referred to as a natural laboratory for the study of continental rift tectonics. It is a fast-spreading intra-continental rift, with the geodetically measured extension varying from ~5 mm/yr at the eastern part, to ~15 mm/yr at the western part. It is structured by a set of E-W striking, en-echelon active normal faults, pr...

On June 8, 2008, at 12:25 GMT, a Mw 6.4 earthquake, the Movri Mountain earthquake, occurred in the area of northwest Peloponnese, western Greece. The epicenter was located in the municipality of Movri, 35 km southwest of Patras. For this study, a crustal anisotropy analysis was performed in the epicentral area of the Movri Mountain earthquake. Spec...

On June 8, 2008, at 15:25 local time (12:25 GMT) an Mw 6.4 earthquake occurred in the area of northwest Peloponnese, Western Greece. The epicenter was located in the municipality of Movri, about 35 km southwest of Patras. A crustal anisotropy analysis was performed in the epicentral area in relation to the occurrence of the earthquake. We used seis...