| Date: | 2010-05-11 09:15:00 | |
| Sender: | Bernd Sierk, BKG/TIGO, Concepcion <Bernd Sierk <sierk@tigo.cl>> | |
| Subject: | [SLR-Mail] No. 1868: 7405 CONL: TIGO is back after earthquake | |
| Author: | Bernd Sierk, BKG | |
| Content: | ******************************************************************************** SLR Electronic Mail 2010-05-11 09:15:00 UTC Message No. 1868 ******************************************************************************** Author: Bernd Sierk, BKG/TIGO, Concepcion Subject: 7405 CONL: TIGO is back after earthquake Dear colleagues, I am glad to announce that the TIGO SLR-unit is fully operational again. After the devastating earthquake on February 27, 2010 we had to re-position the telescope as well as the entire laser container and all optical components therein. Both units had been replaced by approx. 50 cm wrt. each other. Much larger was the seismic displacement of more than 3 meters towards Southwest, as inferred from GPS. There are various GPS solutions ”on the market” (e.g. see the IGS solutions for delta X, Y, and Z) and I guess the analysis centers will soon have results for new coordinates based on SLR data. We have been tracking in continuous mode since April 29, and acquired more than 120 passes since then. There has been period of experimental operation between April 14 and 15 in which we measured 53 passes, however a mechanical damage occured and the telescope has been levelled again between April 15 and 29. All data measured after the quake are currently being quarantined to give the Analysis Working Group time to scrutinize the quality before it is released through the normal channels. As we had to move the telescope the eccentricity wrt. to the system reference point has changed and was determined as usual after telescope maintenance. The new values are: North [m]: -0.1891 +- 0.0010 East [m]: 0.0063 +- 0.0010 Up [m]: 1.4638 +- 0.0007 I have prepared a new site log file indicating the new ecentricity values (in section 3.04), which should be online soon. The SOD (now 74057904) was increased in all data acquired since April 14. I would like to thank the entire SLR community for its support and encouragement in the difficult time after the earthquake. The TIGO-SLR team is looking forward to see you all on the ILRS workshop in Concepción, still scheduled on January 17-22, 2011. I hope to be able to distribute more detailed information on this event in a first circular message soon. Best regards, Bernie From: Bernd Sierk ******************************************************************************** |