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Earth, Planets and Space
Fig. 2 | Earth, Planets and Space

Fig. 2

From: Development of a modified envelope correlation method based on maximum-likelihood method and application to detecting and locating deep tectonic tremors in western Japan

Fig. 2

Single-tremor detection result. a The star shows the final location of the tremor. The tremor occurred at 02:56:05 on May 3, 2010, with a hypocentral location of 33.965°N, 133.252°E, and 23.8 km depth. The heatmap shows the ACC distribution at 30 km depth, determined using the weights calculated as the squares of the hypocentral distances. The red triangles are the seismic stations used in the analysis that met the outlier control criteria. The white triangles mark the seismic stations that were not used in the analysis owing to cross-correlations that did not meet the required threshold. b ACC distribution and bootstrap method result. The axes show the difference from the final tremor location. The heatmaps show the ACC distribution when the tremor source is located at each point. Each blue dot represents the final tremor location for a set of bootstrap samples. c Relationship between the hypocentral distance and the weight which is the inverse of the error variance. The weight is calculated for each component to determine the tremor location and visualized after normalization by the maximum value

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