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Durham University

Institute of Medieval and Early Modern Studies (IMEMS)

Members

The list below shows Durham University research staff who are members of IMEMS. Click the member's name to see a more detailed biography and department.

We also welcome anyone from outside the University with an interest in our work to join. Membership is free of charge. You will receive invitations to our programme of events, with a weekly emails digest about what is happening in the Insitute and further afield. To join IMEMS contact: admin.imems@durham.ac.uk

Publication details for Prof Mark Allen

Xu, YR, He, HL, Deng, QD, Allen, MB, Sun, HY & Bi, LS (2018). The CE 1303 Hongdong earthquake and the Huoshan Piedmont Fault, Shanxi Graben: Implications for magnitude limits of normal fault earthquakes. Journal of Geophysical Research 123(4): 3098-3121.

Author(s) from Durham

Abstract

The CE 1303 Hongdong earthquake, with ~270,000 deaths, has been suggested as the first magnitude 8 earthquake recorded in North China. We use 31 AMS‐14C ages to date earthquakes recorded in the Huoshan Piedmont Fault, which is interpreted to be the causative fault for the event. We interpret fault traces and map the Hongdong earthquake surface rupture in detail. Four events are identified with timings constrained at 1,060–590 year BP (corresponding to the Common Era 1303 event), 3,310–3,210 year BP, 5,460–5,380 year BP, and 26,380 year BP, respectively. The later three events have a recurrence interval of ~2,000–3,000 years. We find that the Hongdong earthquake had a rupture length of ~98 km, a maximum throw of 5.0 m and a best estimate for magnitude in the range Mw 7.2–7.6. We suggest that previous magnitude estimates are overestimates. Normal fault earthquakes have smaller upper limits to their magnitudes than thrusts, because their relatively steep dips produce intersections at the base of the seismogenic layer at smaller downdip widths than gently dipping thrust faults. The Hongdong event was not an exception to this pattern. The historic released seismic moment may be closer to the accumulated moment than previously calculated.