Search for earthquake (382 results)

Bayesian estimation of nonlinear centroid moment tensors using multiple seismic data sets

Mahdi Hamidbeygi, Hannes Vasyura-Bathke, Jan Dettmer, et al.

Published: 2023-03-27
Subjects: Earth Sciences, Geophysics and Seismology

Centroid moment tensor (CMT) parameters of earthquakes are routinely estimated to gain information on structures and regional tectonics. However, for small earthquakes (M<4), it is still challenging to determine CMTs due to the lack of high-quality waveform data. In this study, we propose to improve solutions for small earthquakes by incorporating multiple seismic data types in Bayesian joint [...]

A probabilistic displacement hazard assessment framework for distributed ruptures from strike-slip earthquakes

Alba Mar Rodriguez Padilla, Michael Eugene Oskin

Published: 2023-03-19
Subjects: Engineering, Physical Sciences and Mathematics

Widespread distributed fracturing during earthquakes threatens infrastructure and lifelines. We combine high-resolution rupture maps from the five major surface-rupturing strike-slip earthquakes in southern California and northern Mexico since 1992 to incorporate the displacements produced by secondary ruptures into a probabilistic displacement hazard analysis framework. Through analysis of the [...]

Two decades of seismic risk communication in Europe: a scoping review

Gemma Musacchio, Angela Saraò, Susanna Falsaperla, et al.

Published: 2023-03-15
Subjects: Physical Sciences and Mathematics, Social and Behavioral Sciences

Although earthquakes are a threat in many countries and considerable resources have been invested in safety regulations, communities at risk often lack awareness and preparedness. Risk communication is a key tool for building resilient communities, raising awareness, and increasing preparedness. Over the past two decades, risk communication has evolved significantly. This has led to a [...]

Complex rupture evolution of the 2007 Martinique earthquake: a non-double-couple event in the Caribbean Sea

Kenta Ohara, Yuji Yagi, Ryo Okuwaki

Published: 2023-03-14
Subjects: Earth Sciences, Geophysics and Seismology, Physical Sciences and Mathematics

A large non-double-couple component of a tectonic earthquake indicates that its rupture likely was complex and likely involved multiple faults. Detailed source models of such earthquakes can add to our understanding of earthquake source complexity. The 2007 Martinique earthquake in the Caribbean Sea is one of the largest recent earthquakes with a known large non-double-couple component. It was an [...]

Asperity-like (segmented) structure of the 6 February 2023 Turkish earthquakes

Jiří Zahradník, Fatih Turhan, Efthimios Sokos, et al.

Published: 2023-03-10
Subjects: Geophysics and Seismology

Key to studies of the rupture process is the identification of its major segmentation into asperities. Common multi-parametric methods invert for a continuous slip distribution; they usually rely on a predefined fault position, nucleation point, planarity, smoothing, etc. Here we propose more flexible low-parametric inversions - multi-point seismic source models, and multi-patch GPS models. We [...]

Largest aftershock nucleation driven by afterslip during the 2014 Iquique sequence

Yuji Itoh, Anne Socquet, Mathilde Radiguet

Published: 2023-03-10
Subjects: Earth Sciences, Geophysics and Seismology, Physical Sciences and Mathematics, Tectonics and Structure

Various earthquake source models predict that aseismic slip modulates the seismic rupture process. However, observations of aseismic slip associated with earthquakes are scarce, which has left the earthquake source model controversial. Here, we characterise seismic and aseismic processes for 3 days during the 2014 Iquique earthquake sequence in northern Chile by analysing seismicity and crustal [...]

Multi-scale rupture growth with alternating directions in a complex fault network during the 2023 south-eastern Türkiye and Syria earthquake doublet

Ryo Okuwaki, Yuji Yagi, Tuncay Taymaz, et al.

Published: 2023-03-03
Subjects: Earth Sciences, Geophysics and Seismology, Physical Sciences and Mathematics

A devastating doublet of earthquakes with moment magnitude Mw 7.9 and Mw 7.6 earthquakes contiguously occurred in south-eastern Türkiye near the north-western border of Syria. Here we perform a potency-density tensor inversion to simultaneously estimate rupture evolution and fault geometry for the doublet. We find the initial Mw 7.9 earthquake involves a supershear back-rupture propagation, which [...]

Sub- and super-shear ruptures during the 2023 Mw 7.8 and Mw 7.6 earthquake doublet in SE Türkiye

Diego Melgar, Tuncay Taymaz, Athanassios Ganas, et al.

Published: 2023-02-20
Subjects: Earth Sciences, Physical Sciences and Mathematics

An earthquake doublet (Mw 7.8 and Mw 7.6) occurred on the East Anatolian Fault Zone (EAFZ) on February 6th, 2023. The events produced significant ground motions and caused major impacts to life and infrastructure throughout SE Türkiye and NW Syria. Here we show the results of earthquake relocations of the first 11 days of aftershocks and rupture models for both events inferred from the kinematic [...]

False positives are common in single-station template matching

Jack Broderick Muir, Benjamin Fernando

Published: 2023-02-17
Subjects: Earth Sciences, Geophysics and Seismology, Planetary Geophysics and Seismology, Planetary Sciences

Template matching has become a cornerstone technique of observational seismology. By taking known events, and scanning them against a continuous record, new events smaller than the signal-to-noise ratio can be found, substantially improving the magnitude of completeness of earthquake catalogues. Template matching is normally used in an array setting, however as we move into the era of planetary [...]

Curated Pacific Northwest AI-ready Seismic Dataset

Yiyu Ni, Alexander Hutko, Francesca Skene, et al.

Published: 2023-02-16
Subjects: Geophysics and Seismology

The curation of seismic data sets is the cornerstone of seismological research and the starting point of machine-learning applications in seismology. We present a 21-year-long AI-ready data set of diverse seismic event parameters, instrumentation metadata, and waveforms, as curated by the Pacific Northwest Seismic Network and ourselves. We describe the earthquake catalog and the temporal [...]

Evidence of Early Supershear Transition in the Feb 6th 2023 Mw 7.8 Kahramanmaraş Turkey Earthquake From Near-Field Records

Ares J. Rosakis, Mohamed Abdelmeguid, Ahmed Elbanna

Published: 2023-02-15
Subjects: Aerospace Engineering, Civil and Environmental Engineering, Earth Sciences, Engineering, Mechanical Engineering, Physical Sciences and Mathematics

The Mw7.8 Kahramanmaraş Earthquake was larger and more destructive than what had been expected for the tectonic setting in Southeastern Turkey. By using near-field records we provide evidence for early supershear transition on the splay fault that hosted the nucleation and early propagation of the first rupture that eventually transitioned into the East Anatolian fault. We also find, for the [...]

Coseismic Coulomb Stress Changes on Intraplate Faults in the Western Quebec Seismic Zone, Canada: Implications for Seismic Hazards

Jeremy Rimando, Alexander Lewis Peace, Katsuichiro Goda, et al.

Published: 2023-02-14
Subjects: Earth Sciences

There is currently no active fault map for the intraplate western Quebec seismic zone (WQSZ) in eastern Canada, and consequently, no detailed finite-fault source models which are critical for seismic hazard assessments in this region with a rapidly growing population. While previous numerical stress modelling studies have shown that mostly NNW-SSE to NW-SE-striking faults exhibit the highest [...]

Revealing the hillslope response to earthquake legacy effect using time series InSAR

Nitheshnirmal Sadhasivam, Ling Chang, Hakan Tanyas

Published: 2023-01-31
Subjects: Geomorphology, Other Earth Sciences

Strong earthquakes are not only able to change the earth's surface processes by triggering a large population of coseismic landslides but also by influencing hillslope deformation rates in post-seismic periods. An increase in post-seismic hillslope deformation rates could also be linked to a change in post-seismic landslide hazard level and, thus, could be exploited to better assess post-seismic [...]

From ground motion simulations to landslide occurrence prediction

Ashok Dahal, David Alejandro Casto Cruz, Hakan Tanyas, et al.

Published: 2023-01-17
Subjects: Applied Statistics, Earth Sciences, Geomorphology, Geophysics and Seismology, Physical Sciences and Mathematics, Soil Science, Statistical Models, Statistics and Probability

Ground motion simulations solve wave equations in space and time, thus producing detailed estimates of the shaking time series. This is essentially uncharted territory for geomorphologists, for we have yet to understand which ground motion (synthetic or not) parameter, or combination of parameters, is more suitable to explain the coseismic landslide distribution. To address this gap, we developed [...]

Hillslope recovery after a major earthquake: InSAR-derived time series analyses to capture earthquake-legacy effect

Kun He, Luigi Lombardo, Ling Chang, et al.

Published: 2022-12-23
Subjects: Geomorphology, Geophysics and Seismology

Mountainous landscapes affected by strong earthquakes exhibit relatively higher landslide susceptibility in post-seismic periods compared to pre-seismic conditions. This concept is referred to as the earthquake legacy effect and is mainly examined by monitoring either rapid landslide occurrences or slow-moving landslides over time. To provide a more comprehensive understanding of the concept, [...]


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