Average attenuation of 0.7-5.0 Hz Lg waves and magnitude scale determination for the region bounding the western branch of the East African Rift

Details Average attenuation of 0.7-5.0 Hz Lg waves and magnitude scale determination for the region bounding the western branch of the East African Rift Average attenuation of 0.7-5.0 Hz Lg waves and magnitude scale determination for the region bounding the western branch of the East African Rift

Sep 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998geoji.134..818f&link_type=abstract

Geophysical Journal International, Volume 134, Issue 3, pp. 818-830.

Astronomy and Astrophysics

Astronomy

2

Attenuation, Mb Magnitude, Mblg Magnitude, Qlg

Scientific paper

The investigation of LG attenuation characteristics in the region bounding the western branch of the East African rift system using digital recordings from a seismic network located along the rift between Lake Rukwa and Lake Malawi is reported. A set of 24 recordings of LG waves from 12 regional earthquakes has been used for the determination of anelastic attenuation, QLg , and regional body-wave magnitude, MbLg , scale. The events used have body-wave magnitudes, Mb , between 4.6 and 5.5, which have been determined teleseismically and listed in ISC bulletins. The data were time-domain displacement amplitudes measured at 10 different frequencies (0.7-5.0 Hz). QLg and its frequency dependence, ɛ, in the region can be represented in the form QLg = (186.2 +/- 6.5)F(0.78+/-0.05). This model is in agreement with models established in other active tectonic regions. The LG-wave-based magnitude formula for the region is given by MbLg = log A + (3.76 +/- 0.38) log D - (5.72 +/- 1.06), where A is a half-peak-to-peak maximum amplitude of the 1 s LG wave amplitude in microns and D is the epicentral distance in kilometres. Magnitude results for the 12 regional earthquakes tested are in good agreement with the ISC body-wave magnitude scale.

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