scholarly journals Elastic Fault Interactions and Earthquake Rupture Along the Southern Hellenic Subduction Plate Interface Zone in Greece

2020 ◽  
Vol 47 (13) ◽  
Author(s):  
Vasso Saltogianni ◽  
Vasiliki Mouslopoulou ◽  
Onno Oncken ◽  
Andrew Nicol ◽  
Michail Gianniou ◽  
...  
Keyword(s):  
Earthquake Rupture ◽  
Plate Interface ◽  
Interface Zone ◽  
Fault Interactions

Persistent earthquake-rupture segmentation due to variable interseismic slip accumulation within the southern Hellenic subduction plate-interface zone in Greece

2020 ◽  
Author(s):  
Vasso Saltogianni ◽  
Vasiliki Mouslopoulou ◽  
Onno Oncken ◽  
Andrew Nicol ◽  
Michael Gianniou ◽  
...  
Keyword(s):  
Earthquake Rupture ◽  
Thrust Faults ◽  
Large Magnitude ◽  
Plate Interface ◽  
Slip Rates ◽  
Interface Zone ◽  
Fault Slip Rates ◽  
Fault Interactions ◽  
Gps Velocities ◽  
Subduction System

<p>Increasing evidence suggests that large thrust-faults that splay from the plate-interface to extend within the upper-plate have a significant impact on subduction seismogenesis. The manner in which these two elements, the plate-interface itself and its splay-thrust faults, interact with one another during the earthquake cycle remains, however, poorly explored. Here, we use GPS velocities, constrained by millennial fault slip-rates, to quantify the accumulation (and partitioning) of strain on individual faults of the plate-interface zone and capture their possible interactions. We zoom into the southern Hellenic Subduction System (HSS), where the greatest (M8.3) earthquake and tsunami ever recorded in the Mediterranean was produced by slip on a splay-thrust fault. Our analysis shows that the HSS is kinematically segmented and strain is accumulated at spatially variable rates along individual structures of the plate-interface zone. We find that insterseismic locking reaches up to ~85% and ~45% on the western and eastern segments, respectively, and on structures different to those that ruptured historically. Although the western HSS has been more active recently (e.g. 365 BC), the eastern HSS carries currently higher potential for large-magnitude (M>6) earthquakes andits interface-zone appears to be closer to failure. Elastic fault-interactions are responsible for both significant inter-segment variability in strain-accumulation and millennial uniformity in earthquake rupture-segmentation between eastern and western HSS.</p>

scholarly journals Nicoya earthquake rupture anticipated by geodetic measurement of the locked plate interface

2013 ◽  
Vol 7 (2) ◽  
pp. 117-121 ◽  
Author(s):  
Marino Protti ◽  
Victor González ◽  
Andrew V. Newman ◽  
Timothy H. Dixon ◽  
Susan Y. Schwartz ◽  
...  
Keyword(s):  
Earthquake Rupture ◽  
Geodetic Measurement ◽  
Locked Plate ◽  
Plate Interface

Petrologic and geochemical role of serpentinite in subduction zones and plate interface domains

2015 ◽  
Vol 37 ◽  
pp. 61-64
Author(s):  
Marco Scambelluri ◽  
Enrico Cannaò ◽  
Mattia Gilio ◽  
Marguerite Godard
Keyword(s):  
Subduction Zones ◽  
Plate Interface

INSIGHTS INTO EARTHQUAKE RUPTURE AND RECOVERY FROM PALEOSEISMIC FAULTS

2016 ◽  
Author(s):  
Christie D. Rowe ◽  
◽  
W. Ashley Griffith ◽  
Catherine Ross ◽  
Benjamin Melosh ◽  
...  
Keyword(s):  
Earthquake Rupture

HIGH RESOLUTION CARBONATE RECORDS OF FLUID-FAULT-INTERACTIONS AT THE GREEN RIVER CO2 NATURAL ANALOGUE

2016 ◽  
Author(s):  
Peter M. Scott ◽  
◽  
Alex Maskell ◽  
Alex Maskell ◽  
Aleksey Sadekov ◽  
...  
Keyword(s):  
High Resolution ◽  
Natural Analogue ◽  
Green River ◽  
Fault Interactions

scholarly journals Real-time automatic uncertainty estimation of coseismic single rectangular fault model using GNSS data

2021 ◽  
Vol 73 (1) ◽  
Author(s):  
Keitaro Ohno ◽  
Yusaku Ohta ◽  
Satoshi Kawamoto ◽  
Satoshi Abe ◽  
Ryota Hino ◽  
...  
Keyword(s):  
Real Time ◽  
Disaster Response ◽  
Order Approximation ◽  
Nonlinear Problems ◽  
Large Earthquake ◽  
Fault Model ◽  
Deformation Monitoring ◽  
Model Parameters ◽  
The Sea Of Japan ◽  
Plate Interface

AbstractRapid estimation of the coseismic fault model for medium-to-large-sized earthquakes is key for disaster response. To estimate the coseismic fault model for large earthquakes, the Geospatial Information Authority of Japan and Tohoku University have jointly developed a real-time GEONET analysis system for rapid deformation monitoring (REGARD). REGARD can estimate the single rectangular fault model and slip distribution along the assumed plate interface. The single rectangular fault model is useful as a first-order approximation of a medium-to-large earthquake. However, in its estimation, it is difficult to obtain accurate results for model parameters due to the strong effect of initial values. To solve this problem, this study proposes a new method to estimate the coseismic fault model and model uncertainties in real time based on the Bayesian inversion approach using the Markov Chain Monte Carlo (MCMC) method. The MCMC approach is computationally expensive and hyperparameters should be defined in advance via trial and error. The sampling efficiency was improved using a parallel tempering method, and an automatic definition method for hyperparameters was developed for real-time use. The calculation time was within 30 s for 1 × 106 samples using a typical single LINUX server, which can implement real-time analysis, similar to REGARD. The reliability of the developed method was evaluated using data from recent earthquakes (2016 Kumamoto and 2019 Yamagata-Oki earthquakes). Simulations of the earthquakes in the Sea of Japan were also conducted exhaustively. The results showed an advantage over the maximum likelihood approach with a priori information, which has initial value dependence in nonlinear problems. In terms of application to data with a small signal-to-noise ratio, the results suggest the possibility of using several conjugate fault models. There is a tradeoff between the fault area and slip amount, especially for offshore earthquakes, which means that quantification of the uncertainty enables us to evaluate the reliability of the fault model estimation results in real time.

scholarly journals The Interface Zone of Explosively Welded Titanium/Steel after Short-Term Heat Treatment

2021 ◽  
Author(s):  
Marcin Szmul ◽  
Katarzyna Stan-Glowinska ◽  
Marta Janusz-Skuza ◽  
Agnieszka Bigos ◽  
Andrzej Chudzio ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Intermetallic Phase ◽  
Welding Process ◽  
Carbon Diffusion ◽  
Sharp Interface ◽  
High Plasticity ◽  
Interface Zone ◽  
Before And After ◽  
Wavy Interface ◽  
The Waves

AbstractThis work presents a detailed description of a bonding zone of explosively welded Ti/steel clads subjected to stress relief annealing, applied in order to improve the plasticity of the final product. The typical joint formed by the welding process possesses a characteristic wavy interface with melted regions observed mainly at the crest regions of waves. The interface of Ti/steel clads before and after annealing was previously investigated mostly in respect to the melted regions. Here, a sharp interface between the waves was analyzed in detail. The obtained results indicate that the microstructure of a transition zone of that area is different along the width. After the heat treatment at 600 °C for 1.5 hours, titanium carbide (TiC) together with α-Fe phase forms at the interface in local areas of relatively wide interlayer (~ 1 µm), while for most of the sharp interface, a much thinner zone up to about 400 nm, formed by four sublayers containing intermetallic phase and carbides, is present. This confirms that carbon diffusion induced by applied heat treatment significantly influences the final microstructure of the Ti/steel interface zone. Side bending tests confirmed high plasticity of welds after applied heat treatment; however, the microhardness measurements indicated that the strengthening of the steel in the vicinity of the interface had not been removed completely.

Sign in / Sign up

Export Citation Format

Share Document