New Data on the Olyutorskii Earthquake Acquired via SAR Interferometry

Михайлов, В. О.; Киселева, Е. А.; Arora, Kusumita; Тимошкина, Е. П.; Смирнов, В. Б.; Chadda, R.; Пономарев, А. В.; Shrinagesh, D.

doi:10.1134/s0742046318030053

Cited by 4 publications

(1 citation statement)

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“…Lander and Pinegina (2010) proposed a pattern involving a blind thrust dipping at around 45 0 to the southeast, and extends to the northwest up to the Vyvenskii-Vetveiskii suture, as well as several nearly vertical rear secondary ruptures accommodating strike-slip and smaller thrust displacements. This interpretation was later supported by a SAR interferometry analysis (Mikhailov et al, 2018). Here, we revisit the rupture model using corrected SAR data and incorporating GPS data, which we did not used in this previous study.…”

Section: Olyutorskii Earthquake: Data and Tectonic Settingmentioning

confidence: 80%

Enigma of the Olyutorskii Earthquake Resolved by SAR Interferometry

Mikhailov,

Timoshkina,

Diament

et al. 2023

Pure Appl. Geophys.

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The Mw 7.6 Olyutorskii earthquake of April 20, 2006, struck the southern edge of the Koryak Highland, in a region of great complexity at the junction of the North American, Eurasian, and Pacific plates. This seismic event was notable for several remarkable features. Firstly, it had an unexpectedly large magnitude, leading to a reassessment of the seismic hazard in the Northern Kamchatka region. Secondly, the GCMT focal mechanism solution showed two nodal planes corresponding to nearly thrusting displacements on a 40-51 0 dipping rupture plane. However, geological field studies conducted in the epicentral area allow to map at the surface three primary segments of a120 km long rupture zone. The central segment showed predominant right-lateral strike-slip displacements, while the NE and SW segments exhibited mostly thrusts steeply dipping SE with smaller strike-slip components.Thirdly, aftershocks were recorded in an area extending over 200 km southwestward from the surface ruptures mapped in the field, with an intense activity observed in a vast area 75 km to the NW from the surface ruptures. Fourthly, although the ruptures found during fieldwork were dipping to the SE, most aftershocks occurred NW of them, with their depth decreasing in the NW direction.SAR interferometry resolved this apparent discrepancy between seismological and fieldgeology data, indicating that the primary displacements occurred northwest from the central and southwest segments of the ruptures at the earth's surface.We present in our study a new rupture model based on SAR, GPS, and field geology data.The model consists of a major blind thrust extending NW and three rear subvertical ruptures that reached the earth's surface and were mapped during the field survey. Additionally, models of the

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Section: Olyutorskii Earthquake: Data and Tectonic Settingmentioning

confidence: 80%