多方法联合评估河套地震带的台网监测能力

Abstract

Abstract: Using earthquake catalogue after deleting aftershocks, we combined several kinds of methods to quantitatively calculate and analyze the least magnitude of completeness (M_c) in the Hetao seismic belt. We analyze and judge temporal changes of network monitoring capabilities for this belt. The results show that, since 1970, Hetao seismic belt's network monitoring capabilities has been gradually increasing. Under the condition of Bootstrap 200 times, the M_c value is M_L2.7±0.07 and the distribution of δM_c is basicly controlled in M_L0.1～0.4 by the MAXC methods, however the M_c value is M_L1.6～2.8 by the EMR methods. The range of M_c by the multi-method determined is M_L1.8～3.3, the result of R/S test is M_L3.4. By comparison, we found that aftershock deletion has notable influence in the calculation of M_c, in particular, M_c had M_L0.9 deference before and after deleting the aftershocks by R/S test. On the whole, M_c is decreasing with time, but there are significant non-uniformity changes in small spatial and temporal scales. Maybe, the spatial adjustment of network and the non-uniformity activity of earthquakes are the main factors.

Key words: Calculation of M_c, Multi-method assessment, Aftershock deletion, R/S test, Hetao seismic belt

CLC Number:

P315.7

HAN Xiao-ming, ZHANG Fan, ZHAO Xing. Multi-method Assessment of Network Monitoring Capabilities for the Hetao Seismic Belt[J]. EARTHQUAKE, 2015, 35(4): 64-75.

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Multi-method Assessment of Network Monitoring Capabilities for the Hetao Seismic Belt

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