GPS应变场云图方法识别地震形变场异常初步分析

doi:10.12196/j.issn.1000-3274.2021.03.002

Abstract

Abstract: This paper introduces a method to obtain the anomaly of seismic deformation field by strain field cloud map. The basic idea is as follows. Firstly, we fit the GPS displacement time series in the specified time window, interpolate the velocity field and calculate the strain field. Then we obtain the cloud map of the strain field which varies continuously in space-time sliding with a certain step length and extract the anomaly information of seismic deformation field. We analyzed the relationship between strain field cloud map and Menyuan M_S6.4 earthquake. The results show that this method has certain indicative effect on earthquake. At the 2019 year-end provincial Seismologic Consideration, the practicability of this method is tested by predicting Nenjiang M_L4.5 earthquake. The research shows that this method is an effective and intuitive method to identify abnormal deformation field before earthquake.

Key words: GPS strain cloud map, Deformation feld spatiotemporal evolution, Deformation field anomaly, Seismologic consideration

CLC Number:

P315.7

CHANG Jin-long, GAN Wei-jun, MENG Ling-sheng, ZHU Cheng-lin, LIU Jun-qing. Preliminary Analysis of GPS Strain Field Cloud Method for Idenetifying Seismic Deformation Field Anomalies[J]. EARTHQUAKE, 2021, 41(3): 22-31.

References

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Preliminary Analysis of GPS Strain Field Cloud Method for Idenetifying Seismic Deformation Field Anomalies

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