Proceedings of the 12th International INQUA meeting on paleoseismology, active tectonic and archaeoseismology

262 1 2 T H I N T E R N AT I O N A L I N Q U A M E E T I N G O N PA L E O S E I S M O L O G Y , A C T I V E T E C T O N I C S A N D A R C H A E O S E I S M O L O G Y ( PATA ) , O C T O B E R 6 T H - 1 1 T H , 2 0 2 4 , L O S A N D E S , C H I L E PATA Days 2024 K E Y W O R D S earthquake cluster, Mongolia, slip-rate, paloseismology (1) Université Paris Cité, Institut de Physique du Globe de Paris, CNRS, F-75005 Paris, France. (2) CEA, DAM, Arpajon, France. (31) Department of Geosciences, Baylor University, Waco, TX, United States. (4) NAGRA, Wettingen, Switzerland. (5) Korea Institute of Geoscience and Mineral Resources, Daejeon 34132, Republic of Korea. (6) Institute of Astronomy and Geophysics, Ulaanbaatar, Mongolia. (7) Mongolian University of Science, Ulaanbaatar, Mongolia. (8) Institute of Geosciences, University of Potsdam, Karl-Liebknecht- Strasse 24/25, 14476, Potsdam, Germany. (9) CNEAS Tohoku University, Japan. *Email: klinger@ipgp.fr . Yann Klinger (1) Yacine Benjelloun (1) Laurent Bollinger (2) Steven. L. Forman (3) Angela Landgraf (4) Jin-Hyuck Choi (5) Solène Antoine (1) Ganbold Baatarsuren (6) Gantulga Bayasgalan (7) Youngbeom Cheon (5) Ganzorig Davaasuren (1,6) Gregor Lauer-Dünkelberg (8) Adiya Munkhsaikhan (6) Amarsaikhan Tsogtbaatar (9) Sodnomsambuu Demberel (6) REPEATABILITY OF THE 20TH CENTURY EARTHQUAKE CLUSTER IN MONGOLIA: PALEOSEISMOLOGY ALONG THE TSETSERLEG FAULT (MONGOLIA) A B S T R A C T Mongolia is located at the northern most limit of the India- Eurasia collision zone. During the last century, a series of earthquakes affected this area with 4 magnitude 8 earthquakes between 1905 and 1957. Only in 1905, the Tsetserleg and the Bulnay earthquakes occurred on two faults that are almost intersecting eachothers during a time interval of about 10 days. The objective of this work is to complement the slip distribution for the 1905 Tsetserleg event, the less well known even of the series, as well as to determine the slip rate for that fault and the return- time for earthquakes along that fault. Those characteristics are then compared with similar parameters along the Bulnay fault to demonstrate that such sequence of earthquakes is not necessarily the rule, but rather the exception, and that this sequence of 4 earthquakes in about 50 years might be quite unique.