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6 results for “seismotectonics”
Displacement time series from Foamquake and Gelquake in single- and double asperity configurations: Supplementary material to "Scaled seismotectonic models of megathrust seismic cycles through the lens of dynamical system theory"
<p><span>This dataset includes displacement data from 4 experiments performed with Foamquake and Gelquake (Mastella et al. 2022, Corbi et al., 2013), two scaled seismotectonic models reproducing the megathrust seismic cycle running at the Laboratory of Experimental Tectonics LET (Univ. Roma Tre). These models enable the generation of hundreds of quasi-periodic cycles of stress accumulation and sudden release through the spontaneous nucleation of frictional instabilities within one or many analog seismic asperities. Models are monitored by the means of a high-resolution top-view monitoring camera acquiring images at 7.5 and 50 frames per second for Gelquake and Foamquake, respectively. This dataset has been created with particle image velocimetry (PIV, using MatPIV (Sveen 2004)) through the cross-correlation between consecutive images. The PIV provides us with velocity field time series. These are integrated to obtain displacement time series. From the whole model surface, in each experiment we selected data from a cross-section striking parallel to the trench and located at the downdip center of the asperities. Cross sections are discretized in 28 and 29 target points in Gelquake and Foamquake, respectively. </span></p> <p><span>Displacement time series have been normalized to zero mean and unit variance to ensure the same level of magnitude for comparison between different experiments. Linear and second order polynomial trends have been removed to make the stick-slip confined in a given range and avoid non-stationary behavior. Time series data are not passed through filters (e.g., smoothing or moving average).</span></p> <p><span>Filename informs about the nature of the analog upper plate (i.e., foam and gel) and geometrical configuration of asperities (i.e., mono and twin). Together with individual files for each experiment, this dataset includes a Matlab script (i.e., all_timeseries.m) that allows visualization of displacement time series from individual target points. </span></p> <p><span>This dataset is supplementary to the paper in SEISMICA "Scaled seismotectonic models of megathrust seismic cycles through the lens of dynamical system theory” by Corbi et al. (2024), where detailed descriptions of models and experimental results can be found.</span></p>
Slab metamorphism and interface earthquakes in Peru: implications for along-strike fluid content and seismotectonic variation
<p>Evidenced by a typically shallow subducted thick mid-ocean ridge basalt (MORB) layer that dominates the subducting Nazca plate and a significant lack of arc magmatism, the Peruvian megathrust remain enigmatic in thermal regime and petrological metamorphism. Thermally controlled slab dehydration in the incoming plate may facilitate fluids release and migration which possibly causes fault instability and seismic and aseismic slips. We find that (1) the eclogitization of the MORB layer and the harzburgitization of the ultramafic layer, and the subsequent dehydration embrittlement probably affect interface seismicity in Peru; (2) the subduction of the Nazca Ridge separates southern Peru from north-central Peru, leading to a MORB-dominant oceanic lithosphere beneath Peru associated with an aseismic interface at depth and a lack of arc magmatism; (3) slab dehydration of >0.01 wt%/km accompanied by temperatures of 300-600°C possibly affect the occurrence of earthquakes and slips distributed on the hydrated interface. The along-strike fluid content variation possibly interprets the forearc seismotectonic segmentation associated with pore fluid pressure variation on megathrusts.</p>
Anisotropic Tomography and Seismotectonics of the Longmenshan Fault Zone in East Tibet
<p>This file includes velocity and anisotropic dataset of the Longmenshan Fault Zone in East Tibet.</p>
Slab metamorphism and interface earthquakes in Peru: implications for along-strike fluid content and seismotectonic variation
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Digital Appendix: Seismotectonics of the Rawil Depression (Western Alps, Switzerland): Revisiting Faults, Earthquakes, and Crustal Stresses [Dataset]
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Tectonics and Seismotectonics of high Dragone valley
<p>Seismic data of Piandelagotti-Sant'Anna Pelago-Montefiorino area in the Northern Apennines, Data are dowload from INGV database.</p> <p>The structural geology survey of Fola fault system are survey in outcrop while the structural geology fata of Internal fault</p> <p>are obtained from the scientific literature.</p> <p>.</p>
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