Search for earthquake (287 results)

30-year record of Himalaya mass-wasting reveals landscape perturbations by extreme events

Joshua Nathan Jones, Sarah J Boulton, Georgina Bennett, Martin Stokes, Michael R. Z. Whitworth

Published: 2021-06-18
Subjects: Earth Sciences, Geology, Geomorphology

In mountainous environments, quantifying the drivers of mass-wasting is fundamental for understanding landscape evolution and improving hazard management. Here, we quantify the magnitudes of mass-wasting caused by the Asia Summer Monsoon (ASM), extreme rainfall and earthquakes in the Nepal Himalayas. Using a newly compiled 30-year mass-wasting inventory, we establish empirical relationships [...]

Constraining families of dynamic models using geological, geodetic and strong ground motion data: the Mw 6.5, October 30th, 2016, Norcia earthquake, Italy

Elisa Tinti, Emanuele Casarotti, Thomas Ulrich, Duo Li, Taufiqurrahman Taufiqurrahman, Alice-Agnes Gabriel

Published: 2021-06-10
Subjects: Geophysics and Seismology

The 2016 Central Italy earthquake sequence is characterized by remarkable rupture complexity, including highly heterogeneous slip across multiple faults in an extensional tectonic regime. The dense coverage and high quality of geodetic and seismic data allow to image intriguing details of the rupture kinematics of the largest earthquake of the sequence, the Mw 6.5 October 30th, 2016 Norcia [...]

Spatial and morphometric relationships of submarine landslides offshore west and southwest Iberia

Davide Gamboa, Rachid Omira, Pedro Terrinha

Published: 2021-06-08
Subjects: Earth Sciences, Geology, Geomorphology, Sedimentology, Stratigraphy

Submarine landslides are ubiquitous geohazards in marine environments occurring at multiple scales. Increasing efforts have been made to catalogue and categorise submarine landslides in comprehensive databases, aiming to better understand their preconditioning and trigger factors. Using the recently compiled, open-access MAGICLAND dataset, we investigate the distribution and morphometric trends [...]

Influence of fault zone maturity on fully dynamic earthquake cycles

Prithvi Thakur, Yihe Huang

Published: 2021-06-04
Subjects: Physical Sciences and Mathematics

We study the mechanical response of two-dimensional vertical strike-slip fault to coseismic damage evolution and interseismic healing of fault damage zones by simulating fully dynamic earthquake cycles. Our models show that fault damage zone structure evolution during the seismic cycle can have pronounced effects on the mechanical behavior of locked and creeping fault segments. Immature fault [...]


Sunil Adhikari, Santosh Kumar Shrestha, Samyam Aryal, Roshika Bhattarai

Published: 2021-05-26
Subjects: Engineering

A 7.6 magnitude earthquake occurred in Gorkha district of Nepal leading more than 9,000 estimated casualties, approximately 23,000 injuries and damages on more than half a million structures. For leading and managing the earthquake recovery and reconstruction in Nepal, a legally mandated agency named National Reconstruction Authority (NRA) was established in December 2015 which facilitate and [...]

Automatic seismic swarm analyzer system based on template matching algorithms and Master-Cluster relative location methods

Eduardo Andres Diaz Suarez, Itahiza Dominguez Cerdeña, Carmen Del Fresno

Published: 2021-05-19
Subjects: Geophysics and Seismology

Seismic swarms may have periods of intense activity with a high number of earthquakes per hour, with overlapping events and/or low signal-to-noise ratio seismic records. During these intervals, the manual characterization of the activity can become very complex to perform by seismic or volcanic observatories, resulting in inhomogeneous seismic catalogs. In order to tackle this problem, we have [...]

A numerical study of SMART Cables potential in marine hazard early warning for the Sumatra and Java regions

Amir Salaree, Bruce M Howe, Yihe Huang, Stuart A Weinstein, Andi E Sakya

Published: 2021-05-04
Subjects: Earth Sciences, Geophysics and Seismology, Other Earth Sciences

We present results from a series of exploratory numerical experiments based on ocean bottom pressure and seismic data from a simulated linear array of SMART cable stations off the trench in the Sumatra-Java region. We use six rupture scenarios to calculate tsunami propagation using hydrodynamic simulations. Through these experiments we show that such an addition would result in up to several [...]

Tectonic geomorphology of the Jhelum fault zone & its contiguous regions in western Himalaya

Afroz Ahmad Ahmad Shah, Syaakiirroh Sahari1, Navakanesh B., Nurhafizah A.M., Fu Fui1, Ashwini R., Talha Q.

Published: 2021-05-02
Subjects: Education, Physical Sciences and Mathematics

The western Himalayan syntaxis represents the region where the major Himalayan structures abruptly curve and the cause of the curvature and the tectonic geomorphology of the region has not been fully explored. The lack of detailed structural maps with extensive field-based data is missing, which is mainly because of the political problems related to border sharing between Pakistan, India, and [...]

Bridging spatiotemporal scales of fault growth during continental extension

Sophie Pan, John Naliboff, Rebecca E. Bell, Chris Jackson

Published: 2021-04-21
Subjects: Earth Sciences, Geology, Geophysics and Seismology, Other Earth Sciences, Physical Sciences and Mathematics, Tectonics and Structure

Continental extension is accommodated by the development of kilometre-scale normal faults, which grow by accumulating metre-scale earthquake slip over millions of years. Reconstructing the entire lifespan of a fault remains challenging due to a lack of observational data with spatiotemporal scales that span the relatively short-term earthquake cycle, and the longer-term paleoseismic record. Using [...]

The stabilizing effect of high pore-fluid pressure along subduction megathrust faults: Evidence from friction experiments on accretionary sediments from the Nankai Trough

John Bedford, Daniel Faulkner, Michael Allen, Takehiro Hirose

Published: 2021-04-21
Subjects: Physical Sciences and Mathematics

Pore-fluid pressure is an important parameter in controlling fault mechanics as it lowers the effective normal stress, allowing fault slip at lower shear stress. It is also thought to influence the nature of fault slip, particularly in subduction zones where areas of slow slip have been linked to regions of elevated pore-fluid pressure. Despite the importance of pore-fluid pressure on fault [...]

The 2019-2020 Indios, Puerto Rico earthquake sequence: seismicity and faulting

Blaž Vičič, Seyyedmaalek Momeni, Alessandra Borghi, Anthony Lomax, Abdelkrim Aoudia

Published: 2021-04-20
Subjects: Geophysics and Seismology, Tectonics and Structure

The 2019-2020 Indios, Puerto Rico earthquake sequence ruptured on multiple faults with several moderate magnitude earthquakes. Here we investigate the seismotectonics of this fault system using high precision hypocenter relocation and inversion of the near-field strong motions of five largest events in the sequence (5.6≤Mw≤6.4) for kinematic rupture models. The Mw6.4 mainshock occurred on an NE [...]

Comparison of Machine Learning Approaches for Tsunami Forecasting from Sparse Observations

Christopher M Liu, Donsub Rim, Robert Baraldi, Randall J LeVeque

Published: 2021-04-18
Subjects: Physical Sciences and Mathematics

We have explored various different machine learning (ML) approaches for forecasting tsunami amplitudes at a set of forecast points, based on hypothetical short-time observations at one or more observation points. As a case study, we chose an observation point near the entrance of the Strait of Juan de Fuca, and two forecast points in the Salish Sea, one in Discovery Bay and the other in Admiralty [...]

Structure of the deep lithosphere between Pamir and Tarim

Wasja Bloch, Bernd Schurr, Xiaohui Yuan, Lothar Ratschbacher, Sanaa Reuter, Sofia‑Katerina Kufner, Qiang Xu, Junmeng Zhao

Published: 2021-04-14
Subjects: Earth Sciences, Geophysics and Seismology, Physical Sciences and Mathematics, Tectonics and Structure

The Pamir orogen protrudes $\sim$300-km between the Tajik and Tarim lithosphere of central Asia. It is debated, whether its salient location and shape is controlled by indentation of a promontory of Indian mantle lithosphere or by rollback of thinned Tarim--Tajik-basin lithosphere. We present a new local-seismicity and focal-mechanism catalog and a P-wave velocity model [...]

The state of pore fluid pressure and 3D megathrust earthquake dynamics

Elizabeth Madden, Thomas Ulrich, Alice-Agnes Gabriel

Published: 2021-04-14
Subjects: Earth Sciences

The importance of pore fluid pressure (Pf) for fault strength, stress state and slip behavior holds promise for explaining spatio-temporal subduction zone megathrust behavior, but the coseismic state of Pf and its distribution with depth are poorly constrained. Here, we analyze fault stress states and 3D rupture dynamics of six scenarios based on the 2004 Mw 9.1 Sumatra-Andaman earthquake. We [...]

Coulomb Threshold Rate-and-State Model for Fault Reactivation: Application to induced seismicity at Groningen

Elias Rafn Heimisson, Jonathan D Smith, Jean-Philippe Avouac, Stephen Bourne

Published: 2021-04-06
Subjects: Environmental Monitoring, Geophysics and Seismology, Tectonics and Structure

A number of recent modeling studies of induced seismicity have used the rate-and-state friction model of Dieterich (1994) to account for the fact that earthquake nucleation is not instantaneous. Notably, the model assumes a population of seismic sources accelerating towards instability with a distribution of intial slip speeds such that they would produce earthquakes steadily in absence of any [...]


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