1999/05/01 by Pradeep Talwani, N. Sharma · 1 voice · 2 citations
Earth and Planetary Sciences · Computer Science · #earthquake and tectonic studies #Seismology and Earthquake Studies #Earthquake Detection and Analysis
paper · doi:10.1785/gssrl.70.3.360
openalex publication_date 1999/05/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/06/26
A review of newspaper reports of the three largest aftershocks of the August 31, 1886 Charleston earthquake, which occurred on October 22, 1886 (5:20 aM and 2:45 VM local time) and on November 5, 1886 (12:20 PM local time), doc-uments that they were felt over larger areas than those listed in current catalogs. We estimated felt areas and area within various isoseismal levels. Using recursion relationships of Johnston (1996) between intensity areas and their seismic moments, we have calculated their moment magnitudes. Our results give M w of 5.1, 5.7, and 5.3 for the three events, significantly greater than the m b 4.4, 4.7, and 4.4, respec-tively, listed in current catalogs. These new magnitude sti-mates are probably more reasonable values for the largest aftershocks of the M7.3 mainshock.