Rupture Directivity of the 2021 ML 2.2 Gwangyang, Korea, Microearthquake: Toward Resolving High-Resolution Rupture Process of a Small Earthquake
نویسندگان
چکیده
Abstract Moderate-to-large earthquakes (M>6) frequently show clear rupture directivity. Recent studies revealed that a substantial percentage of small-sized (M<∼5) display directivity as well, owing to enhanced seismic monitoring. Is common feature for all sizes? In this study, we investigated the 27 August 2021 ML 2.2 Gwangyang microearthquake occurred at southern tip Korean Peninsula by utilizing data from recently expanded dense network. The mainshock had two foreshocks and three aftershocks, which enabled us define fault plane precise relative event locations well-constrained focal mechanism. Analysis apparent source time functions obtained with empirical Green’s function technique reveals ruptured unilaterally toward east. A detailed analysis pulse leaving sphere in 3D indicates is consistent geometry slip direction. Our study demonstrates can resolve rupturing microearthquakes (M<∼3) given adequate azimuthal coverage, will lead an improved understanding seismogenic processes regions low seismicity worldwide.
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ژورنال
عنوان ژورنال: The Seismic record
سال: 2022
ISSN: ['2694-4006']
DOI: https://doi.org/10.1785/0320220030