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Power et al. 1998
Power, J.A., Wyss, M. and Latchman, J.L. (1998). Spatial variations in the frequency-magnitude distribution of earthquakes at Soufriere Hills Volcano, Montserrat, West Indies. Geophysical Research Letters 25: doi: 10.1029/98GL00430. issn: 0094-8276.

The frequency-magnitude distribution of earthquakes measured by the b-value is determined as a function of space beneath Soufriere Hills Volcano, Montserrat, from data recorded between August 1, 1995 and March 31, 1996. A volume of anomalously high b-values (b>3.0) with a 1.5 km radius is imaged at depths of 0 and 1.5 km beneath English's Crater and Chance's Peak. This high b-value anomaly extends southwest to Gage's Soufriere. At depths greater than 2.5 km volumes of comparatively low b-values (b~1) are found beneath St. George's Hill, Windy Hill, and below 2.5 km depth and to the south of English's Crater. We speculate the depth of high b-value anomalies under volcanoes may be a function of silica content, modified by some additional factors, with the most siliceous having these volumes that are highly fractured or contain high pore pressure at the shallowest depths. ¿ 1998 American Geophysical Union

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Abstract

Keywords
Seismology, Volcano seismology, Seismology, Earthquake parameters, Volcanology, Eruption mechanisms, Seismology, Seismicity and seismotectonics
Journal
Geophysical Research Letters
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Publisher
American Geophysical Union
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