Upper crust seismic anisotropy study and temporal variations of shear-wave splitting parameters in the western Gulf of Corinth (Greece) during 2013

Κaviris, George; Spingos, Ioannis; Kapetanidis, Vasilis; Papadimitriou, P.; Voulgaris, Nicholas; Μακρόπουλος, Κ.

doi:10.1016/j.pepi.2017.06.006

Cited by 40 publications

(26 citation statements)

References 70 publications

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“…There are only five multiplets of repeating events that last from 1 to 4 yr which are considered as repeaters of continuous type. The aforementioned spatial pattern matches the temporal distinction with most of the burst-like repeaters located onshore in the area of 2013 Aigion swarm (Kapetanidis et al 2015;Mesimeri et al 2016;Kaviris et al 2017) at the southern part of the rift whereas the continuous-type repeaters are located both offshore and beneath the northern coasts of the rift.…”

Section: Spatio-temporal Propertiessupporting

confidence: 64%

Repeating earthquakes in western Corinth Gulf (Greece): implications for aseismic slip near locked faults

Mesimeri

Karakostas

2018

Geophysical Journal International

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An extensive search for repeating earthquakes was performed in the western Corinth Gulf by applying waveform cross-correlation on 22 000 earthquakes that occurred in 2008-2014. Event pairs with high correlation coefficient (CC ≥ 0.95) recorded by two or more stations are classified as multiplets of repeating events. The highly similar event pairs have typically interevent distances less than a quarter wavelength (∼150 m for a dominant frequency of 10 Hz) and are used to estimate the accuracy of the relocated catalogue. A detailed analysis of the spatio-temporal properties of the repeating sequences revealed two types of repeating events, namely, burst-like and continuous-type repeaters. Burst-like repeaters are widespread in the entire study area, mostly associated with seismic excitations located at depths between 5 and 9 km, triggered either by fluid intrusion or stress transfer. Their duration is short with high values of coefficient of variation in recurrence intervals (COV > 1) and high slip rates. The continuous-type repeaters, which last 1-7 yr, with COV ∼ 1 and slip rates almost 0.26 cm yr −1 , form a very narrow shallow north-dipping seismic zone at 10 km depth along the Psathopyrgos and Aigion faults. That kind of activity provides strong evidence for aseismic slip in the western Corinth Gulf and defines the boundary between brittle and ductile layers in the area.

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Section: Spatio-temporal Propertiessupporting

confidence: 64%

Repeating earthquakes in western Corinth Gulf (Greece): implications for aseismic slip near locked faults

Mesimeri

Karakostas

2018

Geophysical Journal International

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“…It could be because there are probably faults or other complex tectonic structures beneath or adjacent to the stations. The same phenomenon has also been observed in North China (Gao et al 2011) and in other regions worldwide, such as the Western Gulf of Corinth in Central Greece (Kaviris et al 2017(Kaviris et al , 2018a. Totally, we obtained SWS parameters in the study area, including Earthquake Catalogue Report (ECR) and identification on microseismic event (IMSE) data.…”

Section: Fast Polarizationsupporting

confidence: 66%

“…) and in other regions worldwide, such as the Western Gulf of Corinth in Central Greece (Kaviris et al . , ). Totally, we obtained SWS parameters in the study area, including Earthquake Catalogue Report (ECR) and identification on microseismic event (IMSE) data.…”

Section: Shear‐wave Splitting Resultsmentioning

confidence: 99%

Preliminary analysis of crustal shear‐wave splitting in the Sanjiang lateral collision zone of the southeast margin of the Tibetan Plateau and its tectonic implications

Gao

Chen

Zhang

et al. 2019

Geophysical Prospecting

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The collision of the Indian and Eurasian plates, to the east of the eastern Himalayan syntaxes, forms the Sanjiang lateral collision zone in the southeast margin of the Tibetan Plateau, where there are intense crustal deformation, active faults, earthquakes, as well as a metallogenic belt. Given the lack of adequate seismic data, shear‐wave splitting in this area has not been studied. With seismic data from a temporary seismic linear array, as well as permanent seismic stations, this paper adopts the identification on microseismic event to pick more events and obtains shear‐wave splitting parameters from local earthquakes. From the west to the east, the study area can be divided into three subzones. The “fast” polarization (i.e. the polarization of the fast shear wave) varies gradually from NNW to NS to NNE in these three subzones. The time delay of the slow shear wave (i.e. the time difference between the two split shear waves) also increases in the same direction, indicating the presence of seismic anisotropy above 25 km in the crust. Both shear‐wave splitting parameters are closely related to stress, faults and tectonics. The scatter and the “dual” (i.e. two) dominant orientations of the fast polarizations at several stations indicate strong distortions caused by nearby faults or deep tectonics. The anisotropic parameters are found to be related to some degree to the metallogenic belt. It is worth to further analyse the link between the anisotropic pattern and the metallogenic area, which suggests that shear‐wave splitting could be applied to study metallogeny. This paper demonstrates that the identification on microseismic event is a useful tool in detecting shear‐wave splitting details and exploring its tectonic implications.

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“…9). This cross-section contains the well-studied earthquake swarm, which was initiated in 2013 May and lasted almost three months (Chouliaras et al 2015;Kapetanidis et al 2015;Mesimeri et al 2016;Kaviris et al 2017). It reveals a north-dipping structure at the southern part of the western Corinth Gulf.…”

Section: Western Corinth Gulfmentioning

confidence: 99%

“…On 2010 January 18, an earthquake doublet occurred near Efpalio beneath the north coasts of the westernmost part of Corinth Gulf with two M w = 5.5 events (Karakostas et al 2012;Sokos et al 2012;Ganas et al 2013). On 2013 May 22, an earthquake swarm that initiated near Aigio, with more than 1500 earthquakes detected in three months (Chouliaras et al 2015;Kapetanidis et al 2015;Mesimeri et al 2016;Kaviris et al 2017).…”

Section: Introductionmentioning

confidence: 99%

Relocation of recent seismicity and seismotectonic properties in the Gulf of Corinth (Greece)

Mesimeri¹,

Karakostas²,

Papadimitriou³

et al. 2017

Geophysical Journal International

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Upper crust seismic anisotropy study and temporal variations of shear-wave splitting parameters in the western Gulf of Corinth (Greece) during 2013

Cited by 40 publications

References 70 publications

Repeating earthquakes in western Corinth Gulf (Greece): implications for aseismic slip near locked faults

Repeating earthquakes in western Corinth Gulf (Greece): implications for aseismic slip near locked faults

Preliminary analysis of crustal shear‐wave splitting in the Sanjiang lateral collision zone of the southeast margin of the Tibetan Plateau and its tectonic implications

Relocation of recent seismicity and seismotectonic properties in the Gulf of Corinth (Greece)

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