Effects of co-seismic strain-step and post-seismic deformation upon the extraction of short-term and imminent earthquake precursor:case study of the 2021 Mw7.4 Maduo earthquake
How to reasonably retrieve the short-imminent earthquake precursors is a very challenging task in earthquake forecasting and prediction.During about two days prior to the Maduo Mw7.4 earthquake(22 May 2021),some anomalous strain with remarkable magnitudes were observed in wavelet detail coefficients at level 11.However,the real mechanism of the precursory strain is still unclear;therefore,further examination is indeed required.In this retrospective study,the attribution analysis is adopted to reveal their origin.The present results suggest that the remarkable strain anomalies were mainly originated from co-seismic strain-steps and post-seismic deformation rather than the short-imminent earthquake precursor.Thus,we can conclude that the misleading results can be retrieved from the continuous strain records with co-seismic strain-steps and post-seismic deformation by means of wavelet transform.
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