Earthquake Cycle Deformation Associated With the 2021 <i>M</i> <sub> <i>W</i> </sub> 7.4 Maduo (Eastern Tibet) Earthquake: An Intrablock Rupture Event on a Slow‐Slipping Fault From Sentinel‐1 InSAR and Teleseismic Data

نویسندگان

چکیده

In the continents, importance of earthquakes that occur away from major block-bounding faults is still debated. The 21 May 2021 MW ∼7.4 Maduo earthquake occurred on a secondary fault previously-identified block boundaries. Here we use seven years Sentinel-1 InSAR time series (between October 2014 and November 2021) to determine distribution coseismic slip early postseismic afterslip following earthquake, preceding interseismic strain accumulation. We devised 13-segment 3-D geometry constrained by SAR range offsets relocated aftershocks used Bayesian method incorporating von Karman regularization solve for models. also teleseismic waveforms as standalone inversion show rupture evolution in space during finding it propagates bilaterally with three notable episodes. Our preferred self-similar model shows moderate shallow deficit, majority moment release occurring depth interval 1-10 km. deficit taken up part at ( < 4 km) depths grows linearly first ∼6 months, > 10 km where logarithmically time. suggest this heterogeneity likely controlled spatial variations friction related lithology. discuss implications seismic hazard tectonic boundaries light our observations cycle intrablock fault.

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ژورنال

عنوان ژورنال: Journal Of Geophysical Research: Solid Earth

سال: 2022

ISSN: ['2169-9356', '2169-9313']

DOI: https://doi.org/10.1029/2022jb024268