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صالح بن إسماعيل القيسي SALEH I. QAYSI

Assistant Professor

Chair of Geology and Geophysics Department, ASSistant Prof. at GGD.

كلية العلوم
Buildin 4, Geology & Geophysics Department, AB 89/3
publication
Journal Article
2020

Crustal Stress in the Northern Red Sea Region as Inferred from Seismic b‑values, Seismic Moment Release, Focal Mechanisms, Gravity, Magnetic, and Heat Flow Data

Al‑Qadasi, Ali K. Abdelfattah, Chokri Jallouli, Saleh Qaysi, Basem . 2020

This study explores the spatial distribution of seismicity, the pattern of b-values, gravity and magnetic anomalies, heat fow data, and focal mechanism solutions to more thoroughly understand the present-day stress distribution and the nature of the crust, which characterize the rifting process in the northern Red Sea region. The region shows alternating low and high b-values in congruence with low and high cumulative seismic moment releases, respectively, and with negative and positive gravity anomalies, respectively. In general, except for larger-sized earthquake locations  that characterized by high stress accumulation, low b-values, low seismic moment release, and low-gravity anomalies dominate the zones of the Gulf of Aqaba and the Gulf of Suez, thereby implying low stress accumulation consistent with an old crust of no diferential development. Conversely, the rest of the Northern Red Sea region exhibited heterogeneities in the spatial distribution of b-values, cumulative seismic moment releases, and gravity anomalies, thereby implying stress heterogeneities. The stress heterogeneities may impute to the diferences in material properties of the upper crust in the region. Zones of a positive Bouguer anomaly and high stress are notably associated with a relatively weak crust characterized by high rate of seismicity, while zones of the negative Bouguer anomaly and low stress characterized an older and more stable crust. However, details on the nature of crust required additional geophysical and geological data of high resolution in future studies.

more of publication
publications

The present study presents the analysis of a moderate earthquake (Mw 4.0) and its largest aftershocks located along the Red Sea coast, southwestern Saudi Arabia, with the aim to understand the…

by .., Saleh Qaysi, etl.
2020
publications

A hydrogeophysical investigation has been conducted along the NE part of the Gulf of Aqaba coast that covered a total area of about 40 km2. The area represents a vital part of the ambitious…

by .., Saleh Qaysi, etl.
2020
publications

This study explores the spatial distribution of seismicity, the pattern of b-values, gravity and magnetic anomalies, heat fow data, and focal mechanism solutions to more thoroughly understand the…

by Ali K. Abdelfattah, Chokri Jallouli, Saleh Qaysi, Basem Al‑Qadasi
2020