UPPER MANTLE SEISMIC VELOCITY OF BAGHDAD SEISMIC STATION USING TRAVEL TIMES-DISTANCE CURVES OF BODY WAVES

Hasanain Jasim Mohammed; Saad H. Faraj

Hasanain Jasim Mohammed Department of Seismology, Iraqi Meteorological Organization and Seismology, Baghdad, Iraq
Saad H. Faraj Department of Seismology, Iraqi Meteorological Organization and Seismology, Baghdad, Iraq

Keywords: Seismictation, Seismological studies, Seismic network, Iraq

Abstract

Travel time-distance curves are plotted using seismic events recorded by Q330 broadband seismic station in Baghdad.Three component STS-2 seismometers record 132, 97 events represented the first arrival of Pn, Sn, respectively for the period between 2010 to January 2015. The minimum and maximum hypocentral distance for these events are 129 and 650 Km, respectively, their magnitudes range between (3.5 – 6.4) on the Richter scale.
The velocity of the upper mantle has been calculated using travel time-distance curve, the velocity values are R2= 8.13,4.49 km/s for Pn, Sn,respectively. The standard deviation (SD) are 1.211, 1.556 and Correlation coefficient 0.9965, 0.9982 for Pn and Sn respectively, VP/VS-ratio beneath seismic Baghdad station is 1.807.