2007年云南泞洱MS6.4地震前滇西南地区震源动力学参数时空变化特征

Abstract

Abstract: On the condition of near-source, the Brune model is employed to determine the focal dynamic parameters of 98 M_L≥2.5 earthquakes occurred in southwest Yunnan during January 2005 to May 2007 with seismic waveform data recorded by the Kunming Digital Seismic Network. Space-time variation characteristics of apparent and corner frequency before 2007 Ning′er M_S6.4 earthquake in Yunnan Province on June 4, 2007 are analyzed. The results show that before Ning′er M_S6.4 earthquake, high apparent stress(higher than 2.5×10⁵ Pa) mainly concentrated in the area from Honghe fault to Wuliangshan fault, distribution of low apparent stress (higher than 2.5×10⁵ Pa) was random and dispersed. Small corner frequency (smaller than 1.5 Hz) mainly concentrated in the area from Honghe fault to Wuliangshan fault, the range of distribution enlarged continuously with the frequency increase until the entire area was covered. And big corner frequency (bigger than 1.5 Hz) mainly concentrated in the southwest of the epicenter area. The apparent stress showed an obvious increase process and the corner frequency including M_L≥3.6 earthquakes showed a decrease-increase-decrease process, but the corner frequency for M_L≤3.6 earthquakes showed a trend of decrease.

Key words: the 2007 Ning′er earthquake, Focal dynamic parameters, Space-time varivation, Southwest Yunnan

CLC Number:

P315.7

LI Yan′e, CHEN Xue-zhong, FU Hong. Temporal and Spatial Variation of Focal Dynamic Parameters in Southwest Yunnan before the 2007 M_S6.4 Ning′er Earthquake[J]. EARTHQUAKE, 2012, 32(1): 28-39.

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Temporal and Spatial Variation of Focal Dynamic Parameters in Southwest Yunnan before the 2007 M_S6.4 Ning′er Earthquake

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Temporal and Spatial Variation of Focal Dynamic Parameters in Southwest Yunnan before the 2007 MS6.4 Ning′er Earthquake

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Temporal and Spatial Variation of Focal Dynamic Parameters in Southwest Yunnan before the 2007 M_S6.4 Ning′er Earthquake