M. Wyss
J.L. Latchman
J.A. Power
1998
<div class=""><div class="article-section__content en main"><div class=""><div class="article-section__content en main"><p>The frequency-magnitude distribution of earthquakes measured by the<span> </span><i>b</i>-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<span> </span><i>b</i>-values (<i>b</i><span> </span>> 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<span> </span><i>b</i>-value anomaly extends southwest to Gage's Soufriere. At depths greater than 2.5 km volumes of comparatively low<span> </span><i>b</i>-values (<i>b</i>∼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<span> </span><i>b</i>-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.</p></div></div></div></div>
application/pdf
10.1029/98GL00430
en
American Geophysical Union
Spatial variations in the frequency-magnitude distribution of earthquakes at Soufriere Hills Volcano, Montserrat, West Indies
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