B-type Earthquake
B-type Earthquake : Earthquakes occurring under volcanoes with emergent onset of P waves, no distinct S waves, and a lower frequency content as compared with the usual tectonic earthquakes of the same magnitude. In the original definition by Minakami (1961) its character difference from the A-type earthquake was attributed to the extremely shallow focal depth (< 1 km). More recently the difference has been attributed to the source process and now called more often long-period (LP) or low-frequency earthquakes. See: Chapter 13 in this Manual
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