Seismic patterns in Northern China and the characteristics of the epicentral distribution of the medium strong earthquakes before the large events |
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| Institution: | 1. Department of Physics University of Azad Jammu and Kashmir Muzaffarabad, 13100, Azad Kashmir, Pakistan;2. Centre for Earthquake Studies National Centre for Physics, Quaid e Azam University, Islamabad, Pakistan;3. University of Michigan, Department of Nuclear Engineering and Radiological Sciences, Ann Arbor, MI, 48109-2104, USA;4. Department of Computer Science and Information Technology, University of Azad Jammu and Kashmir, Muzaffarabad, 13100, Azad Kashmir, Pakistan;5. Department of Medical Physics, Nuclear Medicine, Oncology and Radiotherapy Institute, Islamabad, Pakistan;1. ETH Zurich, Department of Management, Technology and Economics, Scheuchzerstrasse 7, 8092 Zürich, Switzerland;2. ETH Zurich, Department of Earth Sciences, Zurich, Switzerland;3. Institute of Risk Analysis, Prediction and Management (Risks-X), Academy for Advanced Interdisciplinary Studies, Southern University of Science and Technology (SUSTech), Shenzhen 518055, China |
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| Abstract: | In this paper, the seismic pattern in Northern China from 30 ° to 42 ° N latitude and 104 ° to 125 ° E longitude, and the characteristics of the epicentral distribution before large events are presented. The results suggest that: - 1.(1) the earthquakes in the region are mainly located in the orthogonal curvilinear network formed by the seismic belts;
- 2.(2) the larger earthquakes (M ⩾6) occurred mainly in the nodal regions of this grid:
- 3.(3) the strike of the fracture planes of the earthquakes coincided with the directions of the seismic belts;
- 4.(4) the pattern of medium strong earthquakes (M ⩾ 4.7) prior to thirteen large earthquakes (M⩾ 7) are analysed to be of three types:
- 4.1.(a) mainly arranged along the two intersecting belts,
- 4.2.(b) randomly distributed,
- 4.3.(3) forming seismic gaps.
A theoretical basis and rules for drawing the orthogonal grid is presented, and an idea for the prediction of the sites of future earthquakes in Northern China is suggested. |
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