Seismological Observations in and around the Southern Part of the Gulf of Suez, Egypt

Hurukawa, Nobuo; Seto, Norihiko; Inoue, H.; Nishigami, K.; Marzouk, I.; Ibrahim, E. M.; Murakami, Hideki; Nakamura, Miyuki; Haneda, Toshio; Sugiyama, S.; Ohkura, Takahiro; Fujii, Yoshihisa; Hussein, H. M.; Megahed, A.; Mohammed, H. F.; Abdel-Fattah, R.; Mizoue, Megume; Hashimoto, Shuichi; Kobayasi, M.; Suetsugu, D.

doi:10.1785/0120000076

Cited by 15 publications

(10 citation statements)

References 12 publications

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“…1(a)) ranged from 8 to 26 km in depth. Although similar result has been obtained by Hurukawa et al (2001), we showed several earthquake swarms near the entrance of the Gulf of Suez and the southern tip of the Sinai Peninsula, where the trough of the Red Sea ends. Concerning the present study area, the P-wave velocity model improved the routine earthquake locations by the Hurghada seismic network, as shown by considerable reduction of RMS misfit from 0.21 to 0.11 sec.…”

Section: Discussionsupporting

confidence: 91%

One-dimensional P-wave velocity structure in the northern Red Sea area, deduced from travel time data

Mohamed

Miyashita

2014

Earth Planet Sp

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Travel time inversion of local earthquake data was used to improve a one-dimensional (1-D) P-wave velocity structure model for the northern Red Sea area, including the entrance of the Gulf of Suez and the Gulf of Aqaba. The 1-D velocity model and station corrections were obtained by using 1538 P-arrivals from 216 well-located earthquakes recorded at ten local seismic stations from August 1994 to January 1999. Earthquakes used in the present study were located in depths less than 28 km so that the upper 20 km of the 1-D velocity model was well constrained. The resulting P-velocity model indicated velocities from 5.0 to 6.0 km/sec down to a depth of 10 km, and velocities from 6.0 to 6.8 km/sec with a nearly constant gradient in a depth range from 10 to 20 km. This 1-D velocity model reduced the RMS residual by 47% from 0.21 to 0.11 sec and improved routine earthquake locations, which clearly indicated clusters of hypocenters in the southern tip of the Sinai Peninsula and the entrance of the Gulf of Suez. The resulting station corrections suggested irregular surface geology in the area. Negative and positive station corrections were obtained; the minimum value (−0.35) was observed at the station MAZR, while the maximum value (0.24) at SHRM.

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Section: Discussionsupporting

confidence: 91%

One-dimensional P-wave velocity structure in the northern Red Sea area, deduced from travel time data

Mohamed

Miyashita

2014

Earth Planet Sp

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“…Among these events, only few events produced sufficient P wave first motion for single fault plane solution. However, single fault plane solutions as published by Hurukawa et al (2000) indicate some mechanisms, which are not consistent with the dominant extensional stress pattern inferred from geological and geophysical studies. In order to assert the reality of the fault plane solutions, grouping of earthquakes together was done to construct composite fault plane solutions.…”

Section: Focal Mechanismmentioning

confidence: 62%

Preliminary seismicity and focal mechanisms in the southern Gulf of Suez: August 1994 through December 1997

Hussein

Marzouk

Moustafa

et al. 2006

Journal of African Earth Sciences

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“…6). Hurukawa et al (2001) also found great diversity of mechanisms of small events at the southern part of the Gulf. Yet, here we find M L ≥ 4 shocks that are not supported by geophysical data.…”

Section: Discussionmentioning

confidence: 96%

“…The intraplate Carmel‐Fari'a tectonic system, which releases some of the seismicity off the Sinai subplate boundaries, was found to have a sinistral transpressional motion (Hofstetter et al 1996; Ron et al 1990). Other mechanisms, including small events, were also published in the IPRG (Institute for Petroleum Research and Geophysics) Bulletins (1982–1993), Kovach et al (1990), Badawy & Horvath (1999), Badawy (2001), Badawy & Abdel Fattah (2001), Hurukawa et al (2001), and catalogued by Udias et al (1989, and references therein).…”

Section: Introductionmentioning

confidence: 97%

Seismotectonics of the Sinai subplate - the eastern Mediterranean region

Salamon¹,

Hofstetter

Garfunkel

et al. 2003

Geophysical Journal International

169

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SUMMARY We define the Sinai subplate, from a seismotectonic perspective, as a distinct component in the plate tectonics of the eastern Mediterranean region. This is based on the tectonic characteristics of a comprehensive listing of all ML≥ 4 recorded seismicity in the region during the 20th century, on newly calculated and recalculated fault plane mechanisms of first P‐wave arrivals and on published solutions based on waveform inversion of broad‐band data. The low seismicity level and scarcity of strong events in the region required a thorough search for useful data and a careful examination of the reliability of the focal solutions. We gathered all available records of first P‐wave onsets from the ISS and ISC Bulletins and the local seismic networks. Altogether, we were able to calculate 48 new focal mechanisms and 33 recalculated ones of events that occurred during the years 1940–1992. With the increasing number of teleseismic and regional broad‐band stations in the later years, we added 37 solutions based on teleseismic and regional waveform inversions of events that occurred during 1977–2001. These mechanisms enabled us to examine the seismotectonic character of the Sinai subplate. The strike and rake directions of the calculated mechanisms usually reflect the geometry and the large‐scale type of deformation observed along the boundaries of the Sinai subplate—the Dead Sea Transform, the Cypriot Arc convergent zone and the Suez Rift. Nevertheless, along each of these boundaries we found anomalous solutions that attest to the complexity of the deformation processes along plate margins. Earthquakes along the Dead Sea Transform exhibit mainly sinistral transtension and transpression, reflecting its leaky manner and local change in the transform geometry. The presence of other unexpected mechanisms near the transform, however, reflects the heterogeneous deformation it induces around. As expected, thrust mechanisms along the Cypriot Arc mirror its convergent nature and typical curved geometry. Transtension and transpressional solutions in the eastern segment of the arc reflect the sinistral shear motion between Anatolia and Sinai there. However, shear mechanisms found between Cyprus and the Eratosthenes Seamount pose a problem regarding its collision process. Most intriguing of all are ML≥ 4 thrust and shear solutions found in the Gulf of Suez. They are associated with predominantly normal mechanisms within a rift zone and therefore constitute a unique phenomenon, yet to be deciphered.

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Seismological Observations in and around the Southern Part of the Gulf of Suez, Egypt

Cited by 15 publications

References 12 publications

One-dimensional P-wave velocity structure in the northern Red Sea area, deduced from travel time data

One-dimensional P-wave velocity structure in the northern Red Sea area, deduced from travel time data

Preliminary seismicity and focal mechanisms in the southern Gulf of Suez: August 1994 through December 1997

Seismotectonics of the Sinai subplate - the eastern Mediterranean region

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