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ISSN 2070-7401 (Print), ISSN 2411-0280 (Online)
Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa
CURRENT PROBLEMS IN REMOTE SENSING OF THE EARTH FROM SPACE

  

Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa, 2022, Vol. 19, No. 3, pp. 143-152

Model of the rupture surface of the March 29, 2017, South-Ozernoy earthquake from satellite radar interferometry data

V.O. Mikhailov 1, 2 , V.A. Timofeeva 1 , M.S. Volkova 1 
1 Schmidt Institute of Physics of the Earth RAS, Moscow, Russia
2 Lomonosov Moscow State University, Moscow, Russia
Accepted: 30.06.2022
DOI: 10.21046/2070-7401-2022-19-3-143-152
On March 29, 2017 at 04:09:24 GMT (16:09:24 local time), an earthquake with a magnitude of MW = 6.6 occurred in the western Bering Sea. Data on the parameters of the earthquake of different world seismological centers vary. According to NEIC, the epicenter of the earthquake is located 81 km from the Ust-Kamchatsk village (56.940N, 162.786E). The Global CMT catalog contains other coordinates of the epicenter — 57.00N, 163.15E. According to the data of the Kamchatka Branch of the Federal Research Center “Geophysical Survey RAS” (Chebrov et al., 2017), the earthquake hypocenter was located approximately 90 km northeast of Ust-Kamchatsk at a depth of ~43 km and had coordinates 57.0N, 163.2E, i.e. the epicentral area outlined by aftershocks was located in the southern part of the Ozernoy Bay, on the basis of which this earthquake was called the South-Ozernoy earthquake (SOE). Determining the coseismic displacements of the SOE from the data of the permanent sites of the Global Navigation Satellite System (GNSS) turned out to be impossible due to their sparseness and remoteness from the epicenter of the event. It was also not possible to determine the parameters of the rupture surface using the waveform analysis, due to the small magnitude of the event and its remoteness from the stations of the world seismological network. Therefore, the satellite radar interferometry has become almost the only way to determine displacements on the earth’s surface and create a model of the rupture surface. Also, the displacement fields of the earth’s surface can be used to clarify the location of the earthquake hypocenter. We constructed and processed 50 interferometric pairs: from the descending orbit of track 89 of images of Sentinel 1A satellite, as well as pairs of ALOS 2 images from the descending orbit of track 9 and ascending orbit of track 108. The images were mostly selected for the summer period, in order to eliminate the effect of snow cover. Pairs of ALOS 2 images showed displacement fields in the Line-of-Sight (LOS) direction up to 33 cm. The rupture surface parameters are: strike — 213°, depth of the upper edge — 3.8 km, length along the strike — 12.9 km, along the dip — 9.1 km. The amplitude of average displacement is about 1.85 m.
Keywords: South-Ozernoy earthquake, rupture surface model, satellite radar interferometry, remote sensing from space, differential SAR interferometry
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