التفاصيل البيبلوغرافية
| العنوان: |
Daily to Centennial Behavior of Aseismic Slip Along the Central Section of the North Anatolian Fault. |
| المؤلفون: |
Jolivet, R., Jara, J., Dalaison, M., Rouet‐Leduc, B., Özdemir, A., Dogan, U., Çakir, Z., Ergintav, S., Dubernet, P. |
| المصدر: |
Journal of Geophysical Research. Solid Earth; Jul2023, Vol. 128 Issue 7, p1-17, 17p |
| مصطلحات موضوعية: |
PALEOSEISMOLOGY, SYNTHETIC aperture radar, GROUND motion, REMOTE-sensing images, GLOBAL Positioning System, EARTHQUAKES, PORE fluids, FAULT zones |
| مصطلحات جغرافية: |
TURKEY, EURASIA |
| الشركة/الكيان: |
SENTINEL-1 (Artificial satellite) |
| مستخلص: |
Slow, aseismic slip plays a crucial role in the initiation, propagation, and arrest of large earthquakes along active faults. In addition, aseismic slip controls the budget of elastic strain in the crust, hence the amount of energy available for upcoming earthquakes. The conditions for slow slip include specific material properties of the fault zone, pore fluid pressure, and geometrical complexities of the fault plane. Fine scale descriptions of aseismic slip at the surface and at depth are key to determine the factors controlling the occurrence of slow, aseismic versus rapid, seismic fault slip. We focus on the spatial and temporal distribution of aseismic slip along the North Anatolian Fault, the plate boundary accommodating the 2 cm/yr of relative motion between Anatolia and Eurasia. Along the eastern termination of the rupture trace of the 1944 M7.3 Bolu‐Gerede earthquake lies a segment that slips aseismically since at least the 1950s. We use Sentinel 1 time series of displacement and GNSS data to provide a spatio‐temporal description of the kinematics of fault slip. We show that aseismic slip observed at the surface is coincident with a shallow locking depth and that slow slip events with a return period of 2.5 years are restricted to a specific section of the fault. In the light of historical measurements, we discuss potential rheological implications of our results and propose a simple alternative model to explain the local occurrence of shallow aseismic slip at this location. Plain Language Summary: Earthquakes are the manifestation of the rapid release of elastic energy stored in the crust under the action of moving tectonic plates on either sides of a fault system. Interestingly, some faults release energy under the form of aseismic slip, which is slow and harmless. The conditions for slow slip, as opposed to earthquakes, are not fully understood and it appears of higher importance to study high‐resolution, small scale features to grow our understanding. We analyze satellite Radar imagery and GNSS data to build a movie of ground motion in the vicinity of the North Anatolian Fault in Türkiye over a section that was recognized to slip aseismically in the 70s. We show that aseismic slip there is made of slow slip events repeating every 2.5 years embedded within a larger region that slips steadily. Using these data, we model the distribution of slip rates at depth on the fault and show that aseismic slip extends until 5–8 km depth. Below, the fault is locked, accumulating energy for upcoming earthquakes. In the light of past measurements and based on our high‐resolution data set, we discuss potential physical models explaining the occurrence of slow slip in this region. Key Points: We image the spatio‐temporal variations of aseismic slip along the central section of the North Anatolian Fault with Interferometric Synthetic Aperture Radar and GNSS dataSlow slip extends over 70 km, reaches 1 cm/yr and coincides with shallow locking depth along the faultSlow slip events do not occur along the whole creeping section but have been detected since, at least, the 1980s [ABSTRACT FROM AUTHOR] |
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| قاعدة البيانات: |
Complementary Index |
