Inframillimetric slip rate and ∼8kyr long recurrence intervals for Mw ≥ 7.5 earthquakes along the southern section of the Har-Us-Nuur fault (Mongolian Altay)
The Har-Us-Nuur fault corresponds to one of the longest (>500 km) strike-slip fault in Mongolian Altai. Although the fault clearly affects Quaternary deposits, no major instrumental or historical earthquake is associated to it and only a few morphotectonic and paleoseismological analyses have bee...
Saved in:
| Main Authors: | , , , , , , , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
EDP Sciences
2025-01-01
|
| Series: | BSGF - Earth Sciences Bulletin |
| Subjects: | |
| Online Access: | https://www.bsgf.fr/articles/bsgf/full_html/2025/01/bsgf240046/bsgf240046.html |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| Summary: | The Har-Us-Nuur fault corresponds to one of the longest (>500 km) strike-slip fault in Mongolian Altai. Although the fault clearly affects Quaternary deposits, no major instrumental or historical earthquake is associated to it and only a few morphotectonic and paleoseismological analyses have been carried out to date. In this paper, we analyze a previously undescribed surface rupture in the southern section of the Har-Us-Nuur fault along which we study a 20 km long section of it in detail. A morphotectonic analysis yielded a minimum slip rate of 0.32 ± 0.04 mm.yr−1, while paleosismological investigations suggest a mean recurrence interval of about 8.1 ± 3.4 kyr from the characterization of three surface rupturing events that occurred over the past 23 kyr. These preliminary results suggest that the Har-Us-Nuur fault slip rate is inframillimetric and therefore lower than previous published estimates. They also suggest that the fault is able to produce major earthquakes (Mw ≥7.5) separated by very long period of quiescence. |
|---|---|
| ISSN: | 1777-5817 |