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Crustal Strain and Stress Fields in Egypt from Geodetic and Seismological Data.
- Source :
- Remote Sensing; Apr2021, Vol. 13 Issue 7, p1398, 1p
- Publication Year :
- 2021
-
Abstract
- The comparison between crustal stress and surface strain azimuthal patterns has provided new insights into several complex tectonic settings worldwide. Here, we performed such a comparison for Egypt taking into account updated datasets of seismological and geodetic observations. In north-eastern Egypt, the stress field shows a fan-shaped azimuthal pattern with a WNW–ESE orientation on the Cairo region, which progressively rotated to NW–SE along the Gulf of Aqaba. The stress field shows a prevailing normal faulting regime, however, along the Sinai/Arabia plate boundary it coexists with a strike–slip faulting one (σ<subscript>1</subscript> ≅ σ<subscript>2</subscript> > σ<subscript>3</subscript>), while on the Gulf of Suez, it is characterized by crustal extension occurring on near-orthogonal directions (σ<subscript>1</subscript> > σ<subscript>2</subscript> ≅ σ<subscript>3</subscript>). On the Nile Delta, the maximum horizontal stress (S<subscript>Hmax</subscript>) pattern shows scattered orientations, while on the Aswan region, it has a WNW–ESE strike with pure strike–slip features. The strain-rate field shows the largest values along the Red Sea and the Sinai/Arabia plate boundary. Crustal stretching (up to 40 nanostrain/yr) occurs on these areas with WSW–ENE and NE–SW orientations, while crustal contraction occurs on northern Nile Delta (10 nanostrain/yr) and offshore (~35 nanostrain/yr) with E–W and N–S orientations, respectively. The comparison between stress and strain orientations over the investigated area reveals that both patterns are near-parallel and driven by the same large-scale tectonic processes. [ABSTRACT FROM AUTHOR]
- Subjects :
- GEODETIC observations
SURFACE strains
RIFTS (Geology)
Subjects
Details
- Language :
- English
- ISSN :
- 20724292
- Volume :
- 13
- Issue :
- 7
- Database :
- Complementary Index
- Journal :
- Remote Sensing
- Publication Type :
- Academic Journal
- Accession number :
- 149715373
- Full Text :
- https://doi.org/10.3390/rs13071398