Observation Center of seismic and volcanic study

YEMEN REPUBLICYEMEN REPUBLICMinistry of Oil and MineralsMinistry of Oil and Minerals

الله بسمالرحيم الرحمن

Naji A. S. Husain AlhetarChief of

Geophysical department and Strong motion data analysis and manegement.naji_husain@yahoo.com

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)(.

Historical seismic and volcanic activity in Yemen

742-1899

The 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.

The worldwide Instrumental seismic observed events within Yemen

1900-1994

YemenThe 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,

After December 13,1982 Dhamar earthquake. Was The first time to use seismic instrument in Yemen

Red Sea

Gulf of Aden

Yemen

Dhamar

RedSea

After 13th 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

Dhamar

Digital-telephone

Lines stations

Telemetry

stations

Yemeni seismological networks

BB station

TWSBB station

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

Strong motion stations

Strong motion stations

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

Satellite real time seismic station & hub

TWSBB station

GFZ support two stations Yemen support one station + hub

Telemetry remote & recording stations

Field stationsRepeating stations

Central recording station

First operation time1997

SEISAN

Yemen

Saudi ArabiaOman

Gulf of Aden

Yemen

Saudi Arabia Oman

Gulf of Aden

48o42o 54o

18o

12o

Epicenters map (1995-2006)

The amount of information available about local seismicity in Yemen grew exponentially following the installation of the Yemen Seismological Network.

Site map

Preliminary seismic bulletin

PAST 24 HOURS

PAST 7 DAYS

PAST 30 DAYS

PAST 3 MONTHS

SEISMIC BULLETIN By Selecting DateEPICENTER MAP

Last Annual Seismic Bulletin

SEISMIC BULLETINSEISMIC DATA CHARTEPICENTER MAPDOWNLOAD  SEISMIC BULLETIN

YEAR-2003

YEAR-2004

YEAR-2003

YEAR-2004

Site map options

Website :www.nsoc.org.ye

NO

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

SOC web site

Red Sea

Yemen

Saudi Arabia

Gulf of Aden

Oman

the Center location in dhamar city 80km south of The Capital Sana’a

Red Sea

Yemen

Saudi Arabia

Gulf of Aden

Oman

Thank you