1. Observation Center of seismic and volcanic study YEMEN REPUBLIC Ministry of Oil and Minerals بسم الله الرحمن الرحيم Naji A. S. Husain Alhetar Chief of Geophysical department and Strong motion data analysis and manegement. naji_husain@yahoo.com

2. Yemen is located in the southern west of the Arabian peninsula, situated within one of the major active tectonic plate called the Arabian plate, and closed to the well known active seismic zone of the red and Gulf f Aden. The extension spreading center in the read sea and transform fault in the Gulf of Aden as the main impact, which reflected by epicenter locations. INTRODUCTION Fig.()

3. Historical seismic and volcanic activity in Yemen 742-1899 T he historical earthquakes have taken care by Yemen and Islamic history, they had been observed and documented many Reviewers and references, based on the effected and damaged on lives and earth surface.

4. The worldwide Instrumental seismic observed events within Yemen 1900-1994 Yemen The seismic recording events during the 19 the century has been detected depend on the worldwide seismic stations. In behalf during that time Yemen strongly effected by some destructive big and moderate events such as the Sadah event with ML=5.6 in 1956 and 13 dec. 1982 in Dhamar with ml=6,

5. After December 13,1982 Dhamar earthquake. Was The first time to use seismic instrument in Yemen Red Sea Gulf of Aden Yemen Dhamar Red Sea After 13 th Dec. 1982 at the Dhamar province in the (central PLATEAU), with Magnitude: 6.0 it was as the biggest event Stroked in Yemen land, it was also the first time to look and understand about instrument needs so we had been started with one MEQ-800 portable instrument for observed and detected the aftershock events. It was the first time in Yemen to use the seismic instruments. In 1993 the National Seismological Observatory Center (NSOC) Installed the SSA- 2 strong motion network. After one year i.e. on November 1994. A short period (SP) network station installed and finally a telemetric network station installed in 1996

6. Dhamar Digital- telephone Lines stations Telemetry stations Yemeni seismological networks BB station TWS BB station

7. Digital telephone lines remote and central stations telephone lines station (remote station) Central station (receiving & acquisition)  X-pitsa, 1992  HYPOCENTER Seiasan and x-pitsa analyzing software HYPOCENTER

8. Strong motion stations Strong motion stations

9. New Accelerograph network operation The Etna is designed to send and receive communications in a variety of ways. The recorder can be connected to the PC directly from the RS-232 port via an RS-232 cable.  The Etna can also be connected to the PC via two modems.  The physical connection between the recorder and the PC is invisible within QuickTalk,  Cooperative with local & central communities for seismic code

10. Satellite real time seismic station & hub TWS BB station GFZ support two stationsYemen support one station + hub

11. Telemetry remote & recording stations Field stationsRepeating stations Central recording station First operation time 1997  SEISAN

12. Yemen Saudi Arabia Oman Gulf of Aden Yemen Saudi Arabia Oman Gulf of Aden 48 o 42 o 54 o 18 o 12 o Epicenters map (1995-2006) The amount of information available about local seismicity in Yemen grew exponentially following the installation of the Yemen Seismological Network.

13. Site map Preliminary seismic bulletin PAST 24 HOURS PAST 7 DAYS PAST 30 DAYS PAST 3 MONTHS SEISMIC BULLETIN By Selecting Date EPICENTER MAP Last Annual Seismic Bulletin SEISMIC BULLETIN SEISMIC DATA CHART EPICENTER MAP DOWNLOAD SEISMIC BULLETIN YEAR-2003 YEAR-2004 YEAR-2003 YEAR-2004 Site map options Website: www.nsoc.org.yewww.nsoc.org.ye

14. NONO DATETIMELOCATION DEPTH MAG. (Ml) YEARMON.DAYHMSLATLONG 120061302142214.8844.22123.2 220061307311212.5047.42172.8 3200613014194512.9048.55253.9 4200613017265915.0145.15122.4 SOC web site PAST 7 DAYS EVENTS

15. SOC web site Red Sea Yemen Saudi Arabia Gulf of Aden Oman

16. the Center location in dhamar city 80km south of The Capital Sana’a Red Sea Yemen Saudi Arabia Gulf of Aden Oman

17. Thank you