Static and Dynamic Scaling Relations for Moderate and Small Earthquakes in the oft-com:office:smarttags" />Yunnan
详细信息
- 责任者：Liu Lifang (Earthquake Administration of Yunnan Province ; Kunming 650224 ; China) ; Yang Jingqiong
- 刊名：Earthquake Research in China
- 出版年：2011
- 卷期：27(3)
- 关键词：震源参数 ; hypocenter parameters ; 云南 ; Yunnan Province
- 页码：p.268-279
- 图表：illus., 36 refs.
- 分类号：0500
- issnNo：ISSN1001-4683
- isbnNo：CN11-2008/P
摘要
The observational seismic S waveform data are corrected by removing the propagation, site effects, instrument etc, and source spectra for the moderate and small earthquakes are obtained. Based on Brune source model and by means of generalized inversion technique, we determined the source parameters including seismic moment, stress drop, source dimension etc. And we estimated the radiated seismic energy for moderate and small earthquakes with the possible underestimation by limited bandwidth recording taken into account. We analyzed the scaling relations of static and dynamic parameters for earthquakes with ML2.0~5.3 in the Yunnan region. The results show that the seismic moment is between 2.1×1012 N·m and 1.2×1016N·m, and there is a linear relation of lgM0=1.01ML+10.59between the seismic moment and local magnitude. The source dimension varies from 86.9m to 1220.4m. The seismic moment and rupture radius remain a linear correlation of lgM0=0.003a+12.90. The stress drop is in the range of 0.03~57.55MPa, and the stress drop increases with seismic moment for M0<4×1014N·m, while it doesn’t vary with seismic moment for M0≥4×1014N·m. The seismic moment shows dependence of the corner frequency. Assuming the constant stress drops, we can obtain the relation of lgfc=-1 3lgM0+5.32 between the seismic moment and corner frequency using least squares fitting. The theoretical radiated seismic energy is between 3.01×106J and 2.06×1012J. The linear relation between the radiated seismic energy and local magnitude is lgER=1.18ML+5.69. The scaled energy increases with seismic moment for M0<4×1014N·m. However it seems that the scaled energy doesn’t vary with seismic moment for M0≥4×1014N·m. The apparent stress is in the range of 0.02~31.4MPa. The apparent stress also seems independent of the seismic depth.