Abstract
A ruptured front obtained from high-frequency energy radiation is the key to understand the complex source. It is commonly observed that rupture fronts derived from different arrays often show some variations due to the obvious difference of the positioning accuracy of the far-field array between the azimuth and the epicentral distance. We developed a new multi-array back-projection method based on the classical back-projection method and applied the method to the 2015 MW7.8 Nepal earthquake. The back azimuth information with small error is separated from the classical back-projection results, and the azimuth intersection of multiple arrays is used to obtain more accurate spatial and temporal distribution information of the source rupture fronts.
Highlights
The array back-projection (BP) method was first successfully used to image the source rupture process of the 2004 Sumatra earthquake (Krüger and Ohrnberger, 2005a; Ishii et al, 2005)
The array signal processing technology is used to analyze the seismic waves recorded at the seismic network, so as to image the position of the source rupture front and obtain the spatial–temporal distribution image of the source rupture process
In order to separate the back azimuth from the results of the classical back-projection method, we connect from the reference station at the center of the array to the highfrequency radiation sources determined by the backprojection method (Figure 4)
Summary
The array back-projection (BP) method was first successfully used to image the source rupture process of the 2004 Sumatra earthquake (Krüger and Ohrnberger, 2005a; Ishii et al, 2005). The distribution of aftershocks is not necessarily uniform, and the location of large aftershocks may not be on the rupture trace of the main shock, so the imaging results of multiple arrays cannot be given in a timely and accurate manner after the earthquake.
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