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The CE 1303 Hongdong earthquake and the Huoshan Piedmont Fault, Shanxi Graben : implications for magnitude limits of normal fault earthquakes.

Xu, Y.R. and He, H.L. and Deng, Q.D. and Allen, M.B. and Sun, H.Y. and Bi, L.S. (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 : solid earth., 123 (4). pp. 3098-3121.

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.

Item Type:Article
Full text:Publisher-imposed embargo
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Status:Peer-reviewed
Publisher Web site:https://doi.org/10.1002/2017JB014928
Publisher statement:Xu, Y., He, H., Deng, Q., Allen, M. B., Sun, H., & Bi, L. (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: Solid Earth, 123, 3098–3121, 10.1002/2017JB014928 (DOI). To view the published open abstract, go to https://doi.org/ and enter the DOI.
Date accepted:14 March 2018
Date deposited:11 April 2018
Date of first online publication:23 March 2018
Date first made open access:23 September 2018

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