Physics
Scientific paper
Nov 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989pepi...58...44a&link_type=abstract
Physics of the Earth and Planetary Interiors, Volume 58, Issue 1, p. 44-51.
Physics
1
Scientific paper
Reliable earthquake catalogues are essential for assessing seismic hazard and understanding the tectonics of an area. These listings should not be used uncritically, however, particularly for early periods. Some developing areas, such as Africa, have poor seismographic coverage, and therefore those earthquakes that do occur there are not well reported, compounding the problem. Pre-instrumental catalogues should not be neglected, and provide valuable information, but careful historical appraisal is necessary. Even in more recent times, felt reports can be used to supplement instrumental information. Early instrumental locations tend to give major events only, and there can be gross mislocations, but these events can be used to define the broad pattern of activity, without the fine detail available from more recent studies. Even in recent times, errors in location can arise from inappropriate velocity models, misinterpretation of phases and the chance misassociation of observations that lead to the listing of spurious events. It is thus essential to check the validity of unusual events in historical catalogues before using them to infer details of tectonic activity and related earthquake hazard. Such caution is particularly necessary in areas of low or sporadic seismicity.
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