Observations of shear-wave splitting parameters in the Western Gulf of Corinth focusing on the 2014 Mw = 5.0 earthquake

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

doi:10.1016/j.pepi.2018.07.005

Cited by 26 publications

(22 citation statements)

References 58 publications

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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: 65%

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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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Section: Fast Polarizationsupporting

confidence: 65%

“…) 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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“…More importantly, a significant pattern of bilateral seismicity migration began to emerge in mid-July 2014 in group #4, originating at Y ≈ 15 km (Figure 5, bottom), spreading towards Y = 25 km and Y = 10 km in a period of two months. Seismic activity at the western part of group #4 was abruptly increased in the form of an aftershock sequence after the occurrence of an M w = 4.6 event on 21 September 2014 [48]. The last major seismicity outbreak at the WGoC during the study period began on 7 November 2014, with an M w = 4.8 event in group #6 (red), offshore Aigion [48].…”

Section: Spatio-temporal Analysis Of Seismicitymentioning

confidence: 97%

“…The method of [47] was not applied to station ALIK, as it could not properly record the teleseismic waveforms. In that case, an orientation correction of N299 • E was adopted after [48], who followed a similar approach, but using the P-wave polarization determined by local earthquakes [35]. For other stations, especially for borehole instruments, the nominal orientations supplied in the stations' metadata were verified.…”

Section: Shear-wave Splitting (Sws) Analysismentioning

confidence: 99%

“…Seismic activity at the western part of group #4 was abruptly increased in the form of an aftershock sequence after the occurrence of an M w = 4.6 event on 21 September 2014 [48]. The last major seismicity outbreak at the WGoC during the study period began on 7 November 2014, with an M w = 4.8 event in group #6 (red), offshore Aigion [48]. The seismic activity spread rapidly in the form of an aftershock sequence, bilaterally along a~7-km-long patch in an E-W direction (Figure A3), but mostly south of the mainshock's epicenter (Figure S22c).…”

Section: Spatio-temporal Analysis Of Seismicitymentioning

confidence: 99%

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Spatiotemporal Properties of Seismicity and Variations of Shear-Wave Splitting Parameters in the Western Gulf of Corinth (Greece)

et al. 2021

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The Western Gulf of Corinth (WGoC) exhibits significant seismicity patterns, combining intense microseismic background activity with both seismic swarms and short-lived aftershock sequences. Herein, we present a catalogue of ~9000 events, derived by manual analysis and double-difference relocation, for the seismicity of the WGoC during 2013–2014. The high spatial resolution of the hypocentral distribution permitted the delineation of the activated structures and their relation to major mapped faults on the surface. The spatiotemporal analysis of seismicity revealed a 32-km-long earthquake migration pattern, related to pore-pressure diffusion, triggering moderate mainshock-aftershock sequences, as fluids propagated eastwards in the course of ~15 months. The anisotropic properties of the upper crust were examined through automatic shear-wave splitting (SWS) analysis, with over 2000 SWS measurements at local stations. An average fast shear-wave polarization direction of N98.8° E ± 2.8° was determined, consistent with the direction of the maximum horizontal regional stress. Temporal variations of normalized time-delays between fast and slow shear-waves imply alterations in the level of stress or microcrack fluid saturation during the long-lasting pore-pressure diffusion episode, particularly before major events. The present study provides novel insights regarding seismicity patterns, active fault structures, anisotropic properties of the upper crust and triggering mechanisms of seismicity in the WGoC.

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Earthquake Diffusion Variations in the Western Gulf of Corinth (Greece)

Michas

Kapetanidis

Κaviris

et al. 2021

Pure Appl. Geophys.

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Observations of shear-wave splitting parameters in the Western Gulf of Corinth focusing on the 2014 Mw = 5.0 earthquake

Cited by 26 publications

References 58 publications

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

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

Spatiotemporal Properties of Seismicity and Variations of Shear-Wave Splitting Parameters in the Western Gulf of Corinth (Greece)

Earthquake Diffusion Variations in the Western Gulf of Corinth (Greece)

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Observations of shear-wave splitting parameters in the Western Gulf of Corinth focusing on the 2014 Mw = 5.0 earthquake

Cited by 26 publications

References 58 publications

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

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

Spatiotemporal Properties of Seismicity and Variations of Shear-Wave Splitting Parameters in the Western Gulf of Corinth (Greece)

Earthquake Diffusion Variations in the Western Gulf of Corinth (Greece)

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Observations of shear-wave splitting parameters in the Western Gulf of Corinth focusing on the 2014 Mw = 5.0 earthquake