1995年河北沙城ML4.1地震发震断层参数测定

EARTHQUAKE ›› 2005, Vol. 25 ›› Issue (2): 69-74.

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Fault plane determination for the 1995 M_L4.1 Shacheng earthquake, Hebei Province

CHEN Xue-zhong¹, WANG Qiong², LIU Dong-ying³

1. Institute of Geophysics, CEA, Beijing 100081;
2. Earthquake Administration of Xinjiang Uygur Autonomous Region, Urumqi 830011;
3. Institute of Crustal Stress, CEA, Beijing 100085, China

Received:2004-08-10 Revised:2004-10-15 Online:2005-04-30 Published:2021-11-10

Abstract

Abstract: By considering 1D finite moving source model propagating unilaterally, the corner frequency is employed to determine the azimuth of rupture propagation direction and source parameters of the July 20, 1995 M_L4.1 Shacheng Earthquake, Hebei Province, such as rupture direction, rupture velocity and fault length, by means of a least-squares approach. The results show that the azimuth angle of the fault plane for this event is about 224°, consistent with aftershock distribution and the NE nodal plane of focal mechanism solution. The seismic Mach number v/c is about 1.85, which means that the average rupture velocity is greater than that of S-wave. Given the velocity of S wave 3.5 km/s, the fault length is about 1.0 km. So the rupture propagated about a length of 1.0 km along the direction from NE to SW at a super velocity of S wave.

Key words: Corner frequency, Least-squares approach, Parameters of fault plane, Seismic Mach number

CLC Number:

P315.3

CHEN Xue-zhong, WANG Qiong, LIU Dong-ying. Fault plane determination for the 1995 M_L4.1 Shacheng earthquake, Hebei Province[J]. EARTHQUAKE, 2005, 25(2): 69-74.

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Fault plane determination for the 1995 M_L4.1 Shacheng earthquake, Hebei Province

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Fault plane determination for the 1995 ML4.1 Shacheng earthquake, Hebei Province

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Fault plane determination for the 1995 M_L4.1 Shacheng earthquake, Hebei Province