| Date: | 2001-07-18 18:55:00 | |
| Sender: | Van Husson, ILRS Central Bureau <###FROM###> | |
| Subject: | [SLR-Mail] No. 785: Status on the movement of Arequipa | |
| Author: | Van Husson, ILRS Central Bureau | |
| Content: | ******************************************************************************** SLR Electronic Mail 2001-07-18 18:55:00 UTC Message No. 785 ******************************************************************************** Author: Van Husson, ILRS Central Bureau Subject: Status on the movement of Arequipa Dear Colleagues, A massive earthquake (8.4) struck beneath southern Peru at 20:33 GMT on June 23, 2001. The earth quake was 175 km West of Arequipa, Peru. There have been a number of large aftershocks with the largest (7.6) being on July 7th at 9:38 GMT, which was 110 km south-southwest of Arequipa. (Check out the graphics below:) http://earthquake.usgs.gov/activity/latest/eq_01_06_23/index.html http://earthquake.usgs.gov/activity/latest/eq_01_07_07/index.html The June 23 shock originated just southeast of the source of a magnitude 7.7 earthquake that occurred in 1996, and it appears to have involved rupture of part of the plate-boundary segment that producedan earthquake of magnitude approximately 9.0 in 1868. The 1868 earthquake was destructive in towns that were heavily damaged in the June 23rd earthquake. The 1868 earthquake produced a tsunami that killed hundredsof people along the South American coast. The 1868 tsunami also caused damage in Hawaii and alarm in Japan. The initial onset on June 23rd consists of two events separated by about 6 seconds. It was followed by at least one larger complex event occurring about 40 seconds later. (Excerpt from USGS) Arequipa´s (Station 7403) first pass after the June 23rd quake was July 3rd (more than a week later). Below is a listing of LAGEOS passes post quake (as of July 17th). 7403 03-jul-2001 18:36 LAGEOS 7403 04-jul-2001 05:05 LAGEOS-2 7403 05-jul-2001 02:59 LAGEOS-2 7403 05-jul-2001 05:33 LAGEOS 7403 09-jul-2001 03:31 LAGEOS-2 7403 09-jul-2001 03:45 LAGEOS 7403 09-jul-2001 07:05 LAGEOS 7403 10-jul-2001 01:42 LAGEOS-2 7403 10-jul-2001 05:46 LAGEOS 7403 10-jul-2001 06:21 LAGEOS 7403 10-jul-2001 23:43 LAGEOS-2 7403 11-jul-2001 00:07 LAGEOS-2 7403 11-jul-2001 03:53 LAGEOS-2 7403 11-jul-2001 04:21 LAGEOS 7403 12-jul-2001 01:43 LAGEOS-2 7403 12-jul-2001 03:17 LAGEOS 7403 13-jul-2001 03:55 LAGEOS-2 7403 13-jul-2001 04:11 LAGEOS-2 7403 13-jul-2001 05:07 LAGEOS 7403 16-jul-2001 02:09 LAGEOS-2 7403 16-jul-2001 02:17 LAGEOS-2 7403 16-jul-2001 04:36 LAGEOS 7403 17-jul-2001 00:19 LAGEOS-2 7403 17-jul-2001 03:33 LAGEOS RESULTS FROM NERC SLR (7403) ANALYSIS ******************************************************************************** |