The report, which the USGS says is the first to try to predict the likelihood of this type of earthquake, identifies 17 areas in eight eastern and central states that have seen a rise in man-made earthquakes since 2009.
A Brownian passage time model is applied to sets of historical earthquakes identified in previous studies.
Gray circles denote all of the earthquakes identified by JMA during the seismic observing period.
The catalog of earthquakes is considered to be a list of earthquakes identified by their occurrence times, magnitudes, and locations.
The locations are within the source region of deep low-frequency earthquakes identified in the Japan Meteorological Agency JMAA) catalogue.
Yellow dots the epicenters of earthquakes identified by the JMA that occurred from March, 2011 to August, 2012 at depths shallower than 20 km.
Most of the off-plane earthquakes identified from the focal depth distribution were not thrust type but tended to have normal-fault type mechanisms (Fig. 5(b)), as reported by Asano et al. (2011).
In contrast, the number of interplate earthquakes, identified by the focal depths and mechanisms, decreased considerably after the mainshock, while intraplate activity, off the plate boundary, occurred simultaneously in both the overriding and subducting plates.
In the first two cases near Beijing and within the Tangshan aftershock zone, we have confirmed that the triggering effect is statistically significant by computing the β statistic from earthquakes identified from high-pass-filtered seismograms.
