University of Asmara (ASM)
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| Contact: |
Ghebrebrhan Ogubazghi |
| E-mail: | |
| Phone: | +291 1 161926 |
| Fax: | +291 1 162236 |
| Address: | Department of Earth Sciences, University of Asmara, University of Asmara, P.O. Box 1220, Asmara, Eritrea |
| Status: | Not reporting |
| Last data: | 2003-11-01 |
| Web page: | |
| Publications: | |
| Description: | Starting from 2001, the data from the Eritrean stations ASME and ABSE that are being reported to the ISC are having some of the preliminary estimates of the parameters of the reported events. Below we give brief explanations on how the estimates are done. Located eventsThe two stations, ASME and ABSE, are located to the west of the active zone. It is known, from the seismic history of the region (Gouin, 1979) and also from geological considerations (Mohr, 1967) that all local events are located to the east of the line joining the two stations. It is also assumed that the events are of shallow depth. With these considerations, events are routinely located using the arrival times of the two stations by giving to the Hypocenter location program (Lienert et al, 1986; and Lienert and Havskov, 1995) an azimuth appropriate to the event. Given the arrival times from the two stations, it is easy to give an approximate azimuth, which may be refined by using the residuals. Although more rigorous analysis of the orders of magnitude of the location errors may best be done when we get more stations, we think that the location of the epicenter and the origin time are quite acceptable. On the other hand, the indicated depths can not be good and should be ignored.Magnitude estimatesThe magnitude that are indicated have been computed from the formula |
| Original data contributed to ISC: |
To update this information, please contact: dco isc.ac.uk |
