Location
San Diego, California
Presentation Date
28 Mar 2001, 4:00 pm - 6:30 pm
Abstract
On August 3rd, 1993, a sequence of earthquakes began in the central part of the Gulf of Aqaba, northern Red Sea at the Aragonese Deep. The largest event (MD = 5.5) on August 3rd had an origin time of 12:42:43.22 GMT, a latitude of 28.628° N and longitude 34.644° E. This event was followed by more than 15000 events greater than 2 magnitude with some felt earthquakes. On the same spot, another sequence of earthquakes began late 1995. The largest event (MD = 5.9) on November 22 had an origin time of 04:15:12.30 GMT, a latitude of 28.8° N and longitude 34.7° E. This event was followed by more than 8000 aftershocks (1.5 D° N – 29.3° N and 34.6° E – 34.9° E. Focal mechanism were investigated by using data set obtained from the Seismic Network of the Seismic Studies Center, King Saud University, Riyadh, Saudi Arabia and the National Seismic Network at Institute of Astronomy and Geophysics Researches, King Abdulaziz City for Science and Technology. The data set included P-wave first motions of significant earthquake activity in this sequences mainly. A total of 67 events was selected for focal mechanism analysis. The P-wave data from the surrounding seismic networks were also utilized additionally. The structural picture revealed fi-om the focal mechanism solutions shows that the area in general characterized by strike-slip and dip-slip faulting. The mechanism of the first consistent with left-lateral strike-slip on N-NE trending faults of the Dead Sea Transform System. The second consistent with normal faults that generally trend E-W. The main objective of this work is to study the focal mechanism of the recent Northern Red Sea sequences of August 1993 and November 1995 and to associate these sequences with faulting types that were found before using different methods.
Department(s)
Civil, Architectural and Environmental Engineering
Meeting Name
4th International Conference on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Publisher
University of Missouri--Rolla
Document Version
Final Version
Rights
© 2001 University of Missouri--Rolla, All rights reserved.
Creative Commons Licensing
This work is licensed under a Creative Commons Attribution-Noncommercial-No Derivative Works 4.0 License.
Document Type
Article - Conference proceedings
File Type
text
Language
English
Recommended Citation
Fayez, Abdulaziz A. S. and Al-Arifi, Nassir S., "Focal Mechanism Analyses of the 1993, 1995 Northern red Sea Sequences Activity" (2001). International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics. 31.
https://scholarsmine.mst.edu/icrageesd/04icrageesd/session10/31
Included in
Focal Mechanism Analyses of the 1993, 1995 Northern red Sea Sequences Activity
San Diego, California
On August 3rd, 1993, a sequence of earthquakes began in the central part of the Gulf of Aqaba, northern Red Sea at the Aragonese Deep. The largest event (MD = 5.5) on August 3rd had an origin time of 12:42:43.22 GMT, a latitude of 28.628° N and longitude 34.644° E. This event was followed by more than 15000 events greater than 2 magnitude with some felt earthquakes. On the same spot, another sequence of earthquakes began late 1995. The largest event (MD = 5.9) on November 22 had an origin time of 04:15:12.30 GMT, a latitude of 28.8° N and longitude 34.7° E. This event was followed by more than 8000 aftershocks (1.5 D° N – 29.3° N and 34.6° E – 34.9° E. Focal mechanism were investigated by using data set obtained from the Seismic Network of the Seismic Studies Center, King Saud University, Riyadh, Saudi Arabia and the National Seismic Network at Institute of Astronomy and Geophysics Researches, King Abdulaziz City for Science and Technology. The data set included P-wave first motions of significant earthquake activity in this sequences mainly. A total of 67 events was selected for focal mechanism analysis. The P-wave data from the surrounding seismic networks were also utilized additionally. The structural picture revealed fi-om the focal mechanism solutions shows that the area in general characterized by strike-slip and dip-slip faulting. The mechanism of the first consistent with left-lateral strike-slip on N-NE trending faults of the Dead Sea Transform System. The second consistent with normal faults that generally trend E-W. The main objective of this work is to study the focal mechanism of the recent Northern Red Sea sequences of August 1993 and November 1995 and to associate these sequences with faulting types that were found before using different methods.
