کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
8913768 1640183 2017 22 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
The 24th January 2016 Hawassa earthquake: Implications for seismic hazard in the Main Ethiopian Rift
ترجمه فارسی عنوان
زمین لرزه ای در اواخر ماه ژانویه سال 2016 هوسا: پیامدهای خطر لرزه ای در رودخانه اتیوپیایی اصلی
کلمات کلیدی
ریت اتیوپی اصلی، خطر لرزه ای، اتیوپی، لرزه خیزی و تکتونیک، تکتونیک قاره ای، مقدار زلزله،
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات زمین شناسی
چکیده انگلیسی
Earthquakes of low to intermediate magnitudes are a commonly observed feature of continental rifting and particularly in regions of Quaternary to Recent volcanism such as in the Main Ethiopian Rift (MER). Although the seismic hazard is estimated to be less in the Hawassa region of the MER than further north and south, a significant earthquake occurred on the 24th January 2016 in the Hawassa caldera basin and close to the Corbetti volcanic complex. The event was felt up to 100 km away and caused structural damage and public anxiety in the city of Hawassa itself. In this paper we first refine the earthquake's location using data from global network and Ethiopian network stations. The resulting location is at 7.0404°N, 38.3478°E and at 4.55 km depth, which suggests that the event occurred on structures associated with the caldera collapse of the Hawassa caldera in the early Pleistocene and not through volcano-tectonic processes at Corbetti. We calculate local and moment magnitudes, which are magnitude scales more appropriate at regional hypocentral distances than (mb) at four stations. This is done using a local scale (attenuation term) previously determined for the MER and spectral analysis for ML and MW respectively and gives magnitude estimates of 4.68 and 4.29. The event indicates predominantly normal slip on a N-S striking fault structure, which suggests that slip continues to occur on Wonji faults that have exploited weaknesses inherited from the preceding caldera collapse. These results and two previous earthquakes in the Hawassa caldera of M > 5 highlight that earthquakes continue to pose a risk to structures within the caldera basin. With this in mind, it is suggested that enhanced monitoring and public outreach should be considered.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of African Earth Sciences - Volume 125, January 2017, Pages 118-125
نویسندگان
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