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Spatio-Temporally Weighted Two-Step Method for Retrieving Seismic MBT Anomaly: May 2008 Wenchuan Earthquake Sequence Being a Case
IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing ( IF 5.5 ) Pub Date : 2020-01-01 , DOI: 10.1109/jstars.2019.2962719
Yuan Qi , Lixin Wu , Miao He , Wenfei Mao

Referring to the first law of geography and its extension in time domain, this research makes improvements on the two-step method (TSM) presented to retrieve seismic microwave brightness temperature (MBT) anomaly, and a new method named spatio-temporally weighted TSM (STW-TSM) is developed. Temporally weighted background is calculated using nonseismic data according to respective time intervals with the shocking year, and applied to remove long-term trend so as to retrieve basic MBT residuals. Spatially weighted background is calculated referring to Euclidean geospatial distance away from the epicenter, and applied to eliminate local meteorological noise so as to retrieve cleaned MBT residuals. With May 2008 Wenchuan earthquake sequence being a case study, significant seismic MBT anomalies at H and V polarizations, 10 days before and after the May 12 Mw7.9 main shock, were retrieved using STW-TSM at 6.9, 10.7, 18.7, and 36.5 GHz, respectively. This study shows that the newly developed STW-TSM is much more qualified. More significant seismic MBT anomalies at H polarization was retrieved as compared to V polarization. More detailed and localized MBT anomalies was uncovered from high frequency bands at 18.7 and 36.5 GHz, while much remarkable anomalies (but less details) were obtained from low frequency bands at 6.9 and 10.7 GHz. This research is valuable for satellite MBT observation, seismic anomaly analysis, and earthquake precursor study.

中文翻译:

地震MBT异常反演的时空加权两步法:以2008年5月汶川地震序列为例

本研究参考地理学第一定律及其时域扩展,对现有的地震微波亮温(MBT)异常反演方法(TSM)和时空加权TSM(TSM)新方法进行了改进。 STW-TSM) 开发。时间加权背景是使用非地震数据根据与冲击年份的相应时间间隔计算的,并应用于去除长期趋势以检索基本MBT残差。空间加权背景是参考距震中的欧几里得地理空间距离计算的,并用于消除局部气象噪声以检索清洁的MBT残差。以 2008 年 5 月汶川地震序列为例,H 和 V 极化的显着地震 MBT 异常,在 5 月 12 日 Mw7.9 主震前后 10 天,分别使用 STW-TSM 在 6.9、10.7、18.7 和 36.5 GHz 下检索。这项研究表明,新开发的 STW-TSM 更加合格。与 V 极化相比,在 H 极化下获得了更显着的地震 MBT 异常。从 18.7 GHz 和 36.5 GHz 的高频段发现了更详细和局部的 MBT 异常,而从 6.9 和 10.7 GHz 的低频段发现了更显着的异常(但细节较少)。该研究对卫星MBT观测、地震异常分析和地震前兆研究具有重要意义。与 V 极化相比,在 H 极化下获得了更显着的地震 MBT 异常。从 18.7 GHz 和 36.5 GHz 的高频段发现了更详细和局部的 MBT 异常,而从 6.9 和 10.7 GHz 的低频段获得了更显着的异常(但细节较少)。该研究对卫星MBT观测、地震异常分析和地震前兆研究具有重要意义。与 V 极化相比,在 H 极化下获得了更显着的地震 MBT 异常。从 18.7 GHz 和 36.5 GHz 的高频段发现了更详细和局部的 MBT 异常,而从 6.9 和 10.7 GHz 的低频段获得了更显着的异常(但细节较少)。该研究对卫星MBT观测、地震异常分析和地震前兆研究具有重要意义。
更新日期:2020-01-01
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