Seismological aspects of the 27 June 2015 Gulf of Aqaba earthquake and its sequence of aftershocks

el-aal, Abd el-aziz Khairy Abd; Badreldin, Hazem

doi:10.1007/s10950-016-9572-x

Cited by 23 publications

(3 citation statements)

References 28 publications

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“…weeks (El-Aal and Badreldin, 2016). Recent seismic data collected by the Saudi Geological Survey (SGS) show that earthquakes concentrate along, and are subparallel to the gulf fault system, as shown in Fig.…”

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confidence: 99%

Interseismic deformation in the Gulf of Aqaba from GPS measurements

Castro-Perdomo

Viltres

Masson

et al. 2021

Geophysical Journal International

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Summary Although the Dead Sea Transform fault system has been extensively studied in the past, little has been known about the present-day kinematics of its southernmost portion that is offshore in the Gulf of Aqaba. Here we present a new GPS velocity field based on three surveys conducted between 2015 and 2019 at 30 campaign sites, complemented by 11 permanent stations operating near the gulf coast. Interseismic models of strain accumulation indicate a slip rate of $4.9^{+0.9}_{-0.6}~mm/yr$ and a locking depth of $6.8^{+3.5}_{-3.1}~km$ in the gulf’s northern region. Our results further indicate an apparent reduction of the locking depth from the inland portion of the Dead Sea Transform towards its southern junction with the Red Sea rift. Our modelling results reveal a small systematic left-lateral residual motion that we postulate is caused by, at least in part, late postseismic transient motion from the 1995 MW7.2 Nuweiba earthquake. Estimates of the moment accumulation rate on the main faults in the gulf, other than the one that ruptured in 1995, suggest that they might be near the end of their current interseismic period, implying elevated seismic hazard in the gulf area.

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confidence: 99%

Interseismic deformation in the Gulf of Aqaba from GPS measurements

Castro-Perdomo

Viltres

Masson

et al. 2021

Geophysical Journal International

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“…To better understand the origin of the earthquake swarm, we follow the procedure of moment tensor inversion by using local/regional seismic data (i.e., Yagi and Nishimura 2011) This is a non-peer reviewed preprint that has been submitted to Journal of Seismology to provide the focal mechanisms of the earthquakes based on a point source approximation. This method has been applied in some previous studies (e.g., Abbes et al 2016;Badreldin 2016). We obtain the moment tensor solution for the six largest earthquakes in the sequence (Table 1, Fig.…”

Section: Moment Tensor Inversionmentioning

confidence: 99%

Excessive seismicity over a limited source: the August 2019 earthquake swarm near Mt. Salak in West Java (Indonesia)

2020

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The triggering mechanism of swarm-like seismicity in the Java Island of Indonesia is generally not well understood. Understanding earthquake swarm phenomena and monitoring in various tectonic settings can be improved by the detection of micro-earthquakes; however, such a catalog is not available due to various reasons including the existing limited seismic network and using an outdated algorithm for events detection. In this study, we analyze the seismic waveforms and explore the detection capability of small earthquakes during the August 2019 earthquake sequence near Mt. Salak (West Java) by using the known matched filter technique (MFT) and relocated events as templates. We analyze continuous waveforms from seven broadband seismic stations in a 150 km radius around the source center and for a ~1 month of data. Our derived complete catalog enables us to analyze the frequencymagnitude distribution of the sequence as well as the spatiotemporal evolution of microseismicity. The six largest events were hybrid-like-type volcano-tectonic earthquakes with oblique-thrust mechanisms. The relocation procedure shows that all of the events are located within a small area of ~2x2 km 2 , probably bounded at 9-12 km of depth. The pattern of seismicity distribution was not clear, however, focal mechanisms might indicate N/NW or E/SE-trending orientation with a steep plane. We detect 280 additional micro-earthquakes to the improved catalog. The b-value of the sequence is close to 1.1, typical for many volcanotectonic events. We show that the swarm might be initiated by the fluid intrusion into the seismogenic zone while the stress changes from the largest event affected the evolution of swarm.

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“…More details about ENSN sensors, acquisitions, and data processing and analysis can be found in [17][18].The dramatic increase in deployment of broadband and very broadband seismic stations in Egypt after 2009 with real-time continuous telemetry has meant that moment tensor determinations have become increasingly feasible, and moment tensor solutions are now a very important product of ENSN. We used a very well-established method [19][20][21][22] and software to perform waveform inversion for the main shock of the 3 September, 2015 earthquake south of El-Dabaa city using waveform data recorded by ENSN broadband and very broadband stations, Fig. 3.…”

Section: Waveform Inversion and Earthquake Source Characterizationmentioning

confidence: 99%

Source Characterization and Ground Motion Modeling Computed From the 3 September 2015 Earthquake, Western Desert, Egypt

el-aal¹,

Tarabees²,

Badreldin³

2017

GEOMATE

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To obtain the characterized source model for prediction of strong ground motions, the ground motion generation area and rupture geometry of an inland crustal earthquake from near-source ground motion records has been estimated. An earthquake, with a magnitude of 4.3 ML and a focal depth of 18 km occurred on September 3, 2015 at 30.45N, 28.44E in the Western Desert of Egypt about 60 km south of El-Dabaa city. This earthquake is the first instrumentally recorded earthquake occurring in this area in several decades. The waveform data of this event has been used for source characterization and ground motion modeling. The present work describes the results of a preliminary study conducted to obtain fault plane solutions of this earthquake from waveform inversion and P-wave polarity. For this purpose, the source parameters related to the strong ground motion were estimated by waveform data and first arrivals recorded by the Egyptian National Seismic Network (ENSN) are used to arrive at focal mechanism solutions. Fault plane solutions for the main shock indicate strike-slip motion. One nodal plate strikes about 330°, is nearly vertical, and indicates right lateral slip. The other nodal plane strikes about 240°, dips very steeply NW, and indicates left lateral slip. Also the peak ground acceleration (PGA) at the El-Dabaa site has been simulated by taking into account an accurate estimation of the source characterization, the path attenuation model, and site amplification. The results have been validated using an actual recording of PGA at one ENSN station that recorded strong ground motion.

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Seismological aspects of the 27 June 2015 Gulf of Aqaba earthquake and its sequence of aftershocks

Cited by 23 publications

References 28 publications

Interseismic deformation in the Gulf of Aqaba from GPS measurements

Interseismic deformation in the Gulf of Aqaba from GPS measurements

Excessive seismicity over a limited source: the August 2019 earthquake swarm near Mt. Salak in West Java (Indonesia)

Source Characterization and Ground Motion Modeling Computed From the 3 September 2015 Earthquake, Western Desert, Egypt

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