Earthquake Geology of the Bulnay Fault (Mongolia)

Rizza, Magali; Ritz, Jean‐François; Prentice, Carol S.; Vassallo, Riccardo; Braucher, Régis; Larroque, Christophe; Arzhannikova, Anastasia V.; Arzhannikov, S.G.; Mahan, Shannon A.; Massault, M.; Michelot, Jean‐Luc; Todbileg, M.

doi:10.1785/0120140119

Cited by 53 publications

(42 citation statements)

References 43 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…In central Asia, large earthquakes (M > 7.5) involving strike-slip faults have generated surface ruptures of several hundred kilometers length with coseismic offsets of several meters (Choi et al, 2018;Klinger et al, 2011;Molnar & Dayem, 2010;Rizza et al, 2011Rizza et al, , 2015Tapponnier & Molnar, 1979). For example, the 2001 M w~7 .8 Koxokili earthquake ruptured the Kunlun fault with coseismic offsets of several meters (Haibing et al, 2005;Klinger et al, 2005;Klinger et al, 2006;van der Woerd et al, 2002).…”

Section: The Role Of Fault Segmentation Along the Tffmentioning

confidence: 99%

“…For example, the 2001 M w~7 .8 Koxokili earthquake ruptured the Kunlun fault with coseismic offsets of several meters (Haibing et al, 2005;Klinger et al, 2005;Klinger et al, 2006;van der Woerd et al, 2002). The largest continental strike-slip surface rupture ever documented is the Bulnay fault system on which two large earthquakes in 1905 ruptured an~670-km length of the fault, with coseismic offsets up to 10 m (Choi et al, 2018;Rizza et al, 2015).…”

Section: The Role Of Fault Segmentation Along the Tffmentioning

confidence: 99%

See 1 more Smart Citation

Rate of Slip From Multiple Quaternary Dating Methods and Paleoseismic Investigations Along the Talas‐Fergana Fault: Tectonic Implications for the Tien Shan Range

et al. 2019

Self Cite

View full text Add to dashboard Cite

The ~400‐km‐long Talas‐Fergana Fault is one of a series of major right‐lateral strike‐slip faults that cross the Tien Shan Range. This fault has been recognized as active in the late Holocene and accommodates part of the deformation induced by the ongoing Indo‐Asian collision. The kinematics and the role of this strike‐slip fault are poorly understood with no large earthquakes reported in the instrumental or historical catalogs, and no well‐constrained geological slip‐rate estimates. Here we used high‐resolution satellite imagery to present a first detailed analysis of the fault segmentation. We identified nine geometric segments based on strike variations for the Talas‐Fergana Fault. Along the Kyldau segment, through morphological analyses of an offset alluvial fan and the application of multiple dating methods (10Be, 26Al, 36Cl, luminescence, and radiocarbon), we calculated a late Quaternary slip rate ranging from 2.2 to 6.3 mm/year. This rate is higher than the geodetic measurements, but the discrepancy can be partly explained if the Talas‐Fergana Fault accommodates shortening by counterclockwise rotation around a vertical axis. Paleoearthquakes identified by trenching indicate that at least two primary surface ruptures (and possibly a third) occurred in the past 3,800 years, and that no large earthquake has ruptured the Kyldau segment since at least 420 years B.P. (possibly within the last 2,700 years), making this fault segment a potential candidate to generate an earthquake with M > 7 in the near future.

show abstract

Section: The Role Of Fault Segmentation Along the Tffmentioning

confidence: 99%

Section: The Role Of Fault Segmentation Along the Tffmentioning

confidence: 99%

Rate of Slip From Multiple Quaternary Dating Methods and Paleoseismic Investigations Along the Talas‐Fergana Fault: Tectonic Implications for the Tien Shan Range

et al. 2019

Self Cite

View full text Add to dashboard Cite

show abstract

“…Cumulative lateral offsets on strike‐slip faults have been measured for decades using the so‐called “back slipping approach” [e.g., Sieh , ; Rockwell et al , ; Ritz et al , ; Klinger et al , , , ; Van der Woerd et al , , ; Haibing et al , ; Mériaux et al , ; Oskin et al , ; Zielke et al , , ; Rizza et al , , ]. The fault is approximated as a vertical plane across which most of the lateral slip occurs.…”

Section: Measurement Of the Fault Lateral Offsetsmentioning

confidence: 99%

Recovering paleoearthquake slip record in a highly dynamic alluvial and tectonic region (Hope Fault, New Zealand) from airborne lidar

et al. 2015

View full text Add to dashboard Cite

Knowing the slip amplitudes that large earthquakes produced in prehistorical times is one key to anticipate the magnitude of large forthcoming events. It is long known that the morphology is preserving remnants of paleoearthquake slips in the form of fault-offset landforms. However, the measured offsets that can be attributed to the most recent paleoearthquakes are generally few along a fault, so that they rarely allow recovering the slip distributions and largest slips of these earthquakes. We acquired~1 m resolution airborne lidar data on a 30 km stretch of a fast-slipping strike-slip fault (eastern Hope Fault, New Zealand) located in a region of high alluvial dynamics where landforms are rapidly evolving. Data analysis reveals >200 offset landforms; only 30% allow a good to moderate quality offset measurement. From these good to moderate quality measures, we recover the slip-length distributions and largest slips of the four most recent large paleoearthquakes and find evidence of 4-6 prior events. The record suggests that large earthquake slip recurred in multiples of about 4 m along the 30 km stretch. Although they have larger uncertainties, the more numerous lower-quality offsets that we also measured reveal a similar earthquake slip record. This shows that, although offset landforms are partly degraded in dynamically active landscapes, they store valuable information on paleoearthquake slips. This information might be recovered provided that the morphology is analyzed at high resolution and "continuously" over a significant fault length. Remote lidar data are powerful to perform such analyses.

show abstract

“…The correlation between the scarp observed in the morphology and the stratigraphy observed in the trench allows interpreting the contact between units 3 and 5 as a fault contact. Units 1b and 1a are clearly capping the underlying units as post-event units, while the colluvial nature of unit 2 suggests that it originated as material that fell down into the fissure at the time of the surface rupture (eg Rizza et al, 2015). It therefore predates the faulting associated with the most recent event.…”

Section: Fig 8 Photo (A) and Log (B) Of The Trench (Western Wall) Omentioning

confidence: 99%

Active tectonics within the NW and SE extensions of the Pambak-Sevan-Syunik fault: Implications for the present geodynamics of Armenia

Ritz

Avagyan

Մկրտչյան

et al. 2016

Quaternary International

Self Cite

View full text Add to dashboard Cite

Earthquake Geology of the Bulnay Fault (Mongolia)

Cited by 53 publications

References 43 publications

Rate of Slip From Multiple Quaternary Dating Methods and Paleoseismic Investigations Along the Talas‐Fergana Fault: Tectonic Implications for the Tien Shan Range

Rate of Slip From Multiple Quaternary Dating Methods and Paleoseismic Investigations Along the Talas‐Fergana Fault: Tectonic Implications for the Tien Shan Range

Recovering paleoearthquake slip record in a highly dynamic alluvial and tectonic region (Hope Fault, New Zealand) from airborne lidar

Active tectonics within the NW and SE extensions of the Pambak-Sevan-Syunik fault: Implications for the present geodynamics of Armenia

Contact Info

Product

Resources

About