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

Simple item page
dc.contributor.authorFerdinand, Richard W.
dc.date.accessioned2016-06-13T06:06:13Z
dc.date.available2016-06-13T06:06:13Z
dc.date.issued1998
dc.descriptionFull text can be accessed at http://gji.oxfordjournals.org/content/134/3/818.shorten_US
dc.description.abstractThe investigation of L G 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 L G 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, Η, 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 L G‐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 L G 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.en_US
dc.identifier.citationFerdinand, R.W., 1998. 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. Geophysical Journal International, 134(3), pp.818-830.en_US
dc.identifier.doi10.1046/j.1365-246x.1998.00616.x
dc.identifier.urihttp://hdl.handle.net/20.500.11810/2433
dc.language.isoenen_US
dc.subjectAttenuationen_US
dc.subjectMb magnitudeen_US
dc.subjectMbLg magnitudeen_US
dc.subjectQ Lgen_US
dc.titleAverage Attenuation of 0.7–5.0 Hz Lg Waves and Magnitude Scale Determination for the Region Bounding the Western Branch of the East African Riften_US
dc.typeJournal Articleen_US
Files
Original bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
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.pdf
Size:
298.91 KB
Format:
Adobe Portable Document Format
Description:
Abstract
Download
License bundle
Now showing 1 - 1 of 1
No Thumbnail Available
Name:
license.txt
Size:
1.71 KB
Format:
Item-specific license agreed upon to submission
Description:
Download
Collections
Department of Geology