长岛震群震源谱参数反演和震源参数特征

doi:10.12196/j.issn.1000-3274.2022.01.006

Abstract

Abstract: Based on the Brune Model, we propose a High-Cut model by introducing the cut-off frequency fmax. We use a two-step inversion method to fit the observed seismic-source spectra and resolve its characteristic parameters. The seismic-source observation spectrum of 71 M_L≥2.5 events of the Changdao swarm was obtained by the Fast Fourier Transformation. The results demonstrate that ① the method can improve the accuracy of spectra parameters significantly. The range of corner frequency of the Changdao swarm is 2~10 Hz, and there is a certain correlation between the stress drop and the moment magnitude. The range of high-frequency is 10~30 Hz, and the relationship between high-frequency and the magnitude of the earthquake is not very obvious. ② Seismic moments of events vary from 10¹²N·m to 10¹⁴ N·m with increase of the magnitude, and the scaling relationship between seismic moment (M₀) and magnitude (M_L) for the region is logM₀=0.977M_L+10.186. Besides, the scaling relationship between moment magnitude (M_W) and magnitude (M_L) for the region is M_W=0.651M_L+0.766. ③ According to the time-domain evolution of relative stress drop, it is found that stress has been released rapidly after the M_L4.5 earthquake on March 3, 2017, and the level of stress drop has fluctuated around the mean value, and most M_L≥3.5 earthquakes occur in the process of recovery after the decrease of stress drop. ④ The range of stress drop is between 0.01 and 1 Mpa. The statistical relationship between stress drop and magnitude is: logσ =1.158M_L-6.591. Moreover, the stress drop increases with magnitude, which is consistent with the result gained by Nuttli that intraplate earthquake follows the ISD model. The stress drop level of the Changdao swarm is obviously low, which reflects the low level oftectonic seress in the epicenter region. But it can be seen that the small and medium earthquakes are active in this region, it is speculated that there are two reasons. Firstly, the Bohai M7 earthquake in 1548 caused the weakening of medillm strength surmoueling focal area in Changdao region. Secondly, the faults in Bohai sea are easy to be peretrated by seawater, which resulting in the increase of pore pressure and decrease of fault strevgth, which leads to a decrease in the shear stress within the fault, and finally causes the frequent earthquake activity at Changdao region with relative lower tectonic stress.

Key words: Corner frequency, Source parameters, Stress drop, Changdao swarm

CLC Number:

P315.7

ZHANG Zheng-shuai, ZHOU Chen, ZHENG Jian-chang, LIU Cheng-yu. Inversion of Seismic-Source Spectral Parameters and Characteristics of the Source Parameters for Changdao Swarm[J]. EARTHQUAKE, 2022, 42(1): 85-98.

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Inversion of Seismic-Source Spectral Parameters and Characteristics of the Source Parameters for Changdao Swarm

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