Detailed new paleoseismic field investigations at two sites on the Talas‐Fergana fault, a poorly known strike‐slip structure that transects the Tien Shan mountain range, document late Holocene slip rates of 11–16 mm a−1. This prominent structure is distinctive in striking obliquely NW‐SE across the Tien Shan, which is otherwise dominated by contractional structures striking generally E‐W. Moreover, a satellite‐based Global Positioning System network spanning the Tien Shan orogen records active N‐S contraction rates of ~20 mm a−1, but limits slip on the Talas‐Fergana fault to <2 mm a−1. This profound mismatch between long‐term geologic and short‐term geodetic slip rates, which may suggest temporal variability in slip, highlights the importance of field‐based investigations as a complement to remotely sensed data, particularly in evaluating models of lithosphere behavior and earthquake probabilities on presently locked faults such as the Talas‐Fergana
Rust, D., Korjenkov, A., Tibaldi, A. (2018). Geologic slip‐rate determinations on the Talas‐Fergana fault: mismatch with geodetic slip rate. GEOPHYSICAL RESEARCH LETTERS, 45(9), 3880-3888 [10.1002/2017GL076990].
Geologic slip‐rate determinations on the Talas‐Fergana fault: mismatch with geodetic slip rate
Tibaldi, A
2018
Abstract
Detailed new paleoseismic field investigations at two sites on the Talas‐Fergana fault, a poorly known strike‐slip structure that transects the Tien Shan mountain range, document late Holocene slip rates of 11–16 mm a−1. This prominent structure is distinctive in striking obliquely NW‐SE across the Tien Shan, which is otherwise dominated by contractional structures striking generally E‐W. Moreover, a satellite‐based Global Positioning System network spanning the Tien Shan orogen records active N‐S contraction rates of ~20 mm a−1, but limits slip on the Talas‐Fergana fault to <2 mm a−1. This profound mismatch between long‐term geologic and short‐term geodetic slip rates, which may suggest temporal variability in slip, highlights the importance of field‐based investigations as a complement to remotely sensed data, particularly in evaluating models of lithosphere behavior and earthquake probabilities on presently locked faults such as the Talas‐FerganaFile | Dimensione | Formato | |
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