Three-dimensional body wave crustal velocity structure and relocation of earthquakes in the Maduo area

Ming-Yuan, Cai; Ji-Feng, Chen; Xin-Xin, Yin

doi:10.1007/s11600-023-01201-6

Artykuł - szczegóły

Tytuł artykułu

Three-dimensional body wave crustal velocity structure and relocation of earthquakes in the Maduo area

Autorzy

Ming-Yuan Cai , Ji-Feng Chen , Xin-Xin Yin

Wybrane pełne teksty z tego czasopisma

https://www.springer.com/journal/11600

Identyfikatory

DOI

10.1007/s11600-023-01201-6

Warianty tytułu

Języki publikacji

Abstrakty

In this study, the double-difference tomography (tomoDD) method is applied to jointly invert the three-dimensional (3-D) crustal velocity structure and earthquake locations in the Maduo area based on automatically and manually picked seismic phase data. The results show that: (1) We speculated that the seismogenic fault is the Kunlun Pass-Jiangcuo Fault based on the spatial distributions of the aftershocks and surface rupture and the strike slip nature of the fault and the mainshock. In addition, a continuous northwest-trending branch fault may exist on the north side of the western section of the Maduo aftershocks. (2) We speculated that the Maduo earthquake was a bilateral rupture based on the media strength of the upper crust and near the surface and the seismic distribution. The findings also provide evidence for the large-scale rupture of the Maduo earthquake. In addition, the high-velocity body to the upper right of the mainshock satisfactorily explains the unobvious rupture above the mainshock. The late weak seismicity indicates that the energy released during the earthquake rupture was sufficient, and it is concluded that the short-term seismic hazard is insignificant. (3) The low S-wave velocity and high wave ratio reflect the existence of crustal fluids in the Maduo area based on the results of previous studies. The Maduo earthquake occurred on the side of the biased high-velocity body in the high-low velocity transition zone, where the stress easily accumulates and is easily released. Therefore, we conclude that the Maduo earthquake accumulated significant stress in the source area. The crustal fluids encountered a hard slope-type high-velocity body and flowed upward into the seismogenic fault, weakening the seismogenic fault. The combined effect of both processes finally triggered the Maduo MS7.4 earthquake.

Słowa kluczowe

Maduo earthquake 2021 double-difference tomography EQTransformer 3-D velocity structure earthquake relocation crustal fluids

trzęsienie ziemi Maduo w 2021 r tomografia dwuróżnicowa EQTransformer struktura prędkości 3-D przemieszczenie trzęsienia ziemi płyny skorupowe

Wydawca

Instytut Geofizyki PAN
Springer

Czasopismo

Acta Geophysica

Rocznik

2024

Tom

Vol. 72, no. 3

Strony

1765--1781

Opis fizyczny

Bibliogr. 98 poz.

Twórcy

autor

Ming-Yuan Cai

mycaii@126.com

Lanzhou Institute of Seismology, China Earthquake Administration, Lanzhou, Gansu, China

autor

Ji-Feng Chen

chenjf163@163.com

Lanzhou Institute of Seismology, China Earthquake Administration, Lanzhou, Gansu, China

autor

Xin-Xin Yin

Lanzhou Institute of Seismology, China Earthquake Administration, Lanzhou, Gansu, China
Institute of Geophysics, China Earthquake Administration, Beijing, China

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