Seismicity of Iraqi western desert and surroundings: As an example of continental intraplate seismicity

Al-Halboosi, Jasim M.; Mohammad, Osama J.; Al-Heety, Emad A.

doi:10.1088/1755-1315/1080/1/012014

Cited by 2 publications

(1 citation statement)

References 20 publications

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“…The Badra-Amarah fault, which runs along the Iraqi-Iranian border and is thought to be the most seismically active fault in Iraq, the Euphrates fault, the Hummar fault (north of Basra), the Al-Refaee fault, and the Kut fault are all seismically active faults in the Mesopotamian Foredeep [37]. A recent study of the seismicity of the Western Desert and its surrounding areas, which represent an important part of the Inner (stable) Arabian Platform, showed that the region was exposed to earthquakes ranging in size from 2 to 3.5, during the period from 1900 to 2017 [55]. The epicenters were grouped into five seismic zones.…”

Section: Seismicity Of Iraqmentioning

confidence: 99%

Evaluation of Return Period and Occurrence Probability of the Maximum Magnitude Earthquakes in Iraq and Surroundings

Al-Heety,

Rafea,

Mohammad

2024

IOP Conf. Ser.: Earth Environ. Sci.

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It has long been clear that earthquake prediction is important from both social and economic perspectives; therefore, the practical objective of today’s earthquake seismology researchers is an effective earthquake prediction program. The purpose of this study is to estimate earthquake probabilities and return periods using an updated earthquake catalogue (1900-2019) for Iraq and its surroundings. Weibull’s formula and inverse Weibull’s formula were employed to calculate the period of return and the occurrence probability of the maximum magnitude earthquake. The return period for earthquakes magnitudes 5 and 7Mw was 1.1 and 10.54 years, respectively, while the occurrence probability was 93.79% and 9.5%, respectively. The greatest magnitude is 7.7, with a 121-year return period and likelihood of approximately 0.82%. The probability of exceedance increased as the time period increased. The return duration was greater for earthquakes of higher magnitudes.

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Section: Seismicity Of Iraqmentioning

confidence: 99%

Evaluation of Return Period and Occurrence Probability of the Maximum Magnitude Earthquakes in Iraq and Surroundings

Al-Heety,

Rafea,

Mohammad

2024

IOP Conf. Ser.: Earth Environ. Sci.

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Using a 1D Radially Symmetric Coda Envelope Model for Robust Moment Magnitude (Mw) Estimation in Iraq’s Tectonically Diverse Zones

Al-Kaabi,

Mayeda,

Roman-Nieves

et al. 2024

Bulletin of the Seismological Society of America

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Robust estimation of moment magnitude (Mw) can be challenging for Iraq due to the strong lateral heterogeneity across diverse tectonic zones. We aim to improve moment magnitude estimation by investigating the reliability of using a 1D coda envelope model in diverse tectonic zones of different lateral effects and offer a way forward for reliable estimates of Mw for small events that are difficult to waveform model. Iraq comprises two main tectonic zones: (1) the Outer platform, consisting of the northwestern Zagros fold-thrust belt and the Mesopotamian foredeep, and (2) the Inner Arabian platform which is overlain by the Iraqi desert. A simple 1D coda envelope model was used because coda waves have a low sensitivity to the source and path heterogeneity. Three separate coda calibrations were conducted to investigate the robustness of a single 1D calibration to fit the country: Whole-region calibration, Zagros calibration, and Mesopotamia calibration. In the whole-region calibration, we used stations from both the Zagros and Mesopotamia zones. In the two other calibration models, we used only stations that were in those particular zones. Ground-truth reference spectra derived from the coda spectral ratio method were used to constrain high-frequency site terms. There was no drastic difference when comparing the moment magnitudes calculated from the waveform modeling and the three calibration models. The results show that the 1D coda envelope model is a reliable method even for a region with diverse tectonic zones. Hence, we recommend using the whole-region calibration model for moment magnitude estimation that provides more complete path coverage and avoids biases introduced by path correction failures. The proposed calibration is a fundamental step in updating the comprehensive earthquake catalog and probabilistic seismic hazard assessments for Iraq.

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Seismicity of Iraqi western desert and surroundings: As an example of continental intraplate seismicity

Cited by 2 publications

References 20 publications

Evaluation of Return Period and Occurrence Probability of the Maximum Magnitude Earthquakes in Iraq and Surroundings

Evaluation of Return Period and Occurrence Probability of the Maximum Magnitude Earthquakes in Iraq and Surroundings

Using a 1D Radially Symmetric Coda Envelope Model for Robust Moment Magnitude (Mw) Estimation in Iraq’s Tectonically Diverse Zones

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