Search for earthquake (362 results)

Evaluating the performance of ground motion models for an intraplate earthquake using Bayesian inference and chimney fragility curves: 2021 Mw 5.9 Woods Point earthquake, Victoria, Australia

James La Greca, Mark Quigley, Jaroslav Vaculik, et al.

Published: 2022-11-15
Subjects: Earth Sciences, Engineering, Physical Sciences and Mathematics, Probability, Statistics and Probability

The 22 September 2021 (AEST) MW 5.9 Woods Point earthquake occurred in an intraplate setting (Victoria, southeastern Australia) approximately 130 km ENE of the central business district of Melbourne (pop. ~5.15 million). A lack of seismic instrumentation and low population density in the epicentral region resulted in a dearth of near-source instrumental and “felt” report intensity data. To [...]

The Seismic Signature of California's Earthquakes, Droughts, and Floods

Marine Denolle, Tim Clements

Published: 2022-11-03
Subjects: Geophysics and Seismology

his study investigates changes in seismic velocities in the period 1999-2021 using about 700 permanent and temporary broadband seismic stations in the state of California. We compute single-station cross-correlations of the ambient seismic noise and use the coda-wave interferometry to measure the changes in seismic velocities ({\it dv/v}) using a stretching technique. We focus on the 2-4Hz [...]

Along-strike spatial variation in shallow slow earthquake activity in Hyuga-nada, southwest Japan

Satoru Baba, Shunsuke Takemura, Kazushige Obara, et al.

Published: 2022-10-28
Subjects: Geophysics and Seismology

Hyuga-nada, off the Pacific coast of Kyushu along the Nankai Trough in southwest Japan, is one of the most active slow earthquake regions around Japan. We estimated the energies of tremors and moments of very low frequency earthquakes (VLFEs) in Hyuga-nada using data from a permanent onshore broadband network and temporary ocean bottom seismometer observations. The energies and moments of these [...]

Restricted rupture evolution of the 2022 Mw 6.7 Luding China earthquake

Hu Yaping, Yagi Yuji, Ryo Okuwaki, et al.

Published: 2022-10-25
Subjects: Earth Sciences, Physical Sciences and Mathematics

On September 5, 2022, a strike-slip earthquake with a moment magnitude (Mw) 6.7 occurred along the Moxi segment of the Xianshuihe fault zone in Luding, Sichuan province, China. To estimate the rupture evolution of the 2022 Luding earthquake, we inverted teleseismic P-waves by applying the Potency Density Tensor Inversion, a novel method that can estimate fault geometry and source process. We [...]

Fault Friction Derived from Fault Bend Influence on Coseismic Slip During the 2019 Ridgecrest Mw 7.1 Mainshock

Chris Milliner, Saif Aati, Jean-Philippe Avouac

Published: 2022-10-18
Subjects: Earth Sciences, Geology, Geophysics and Seismology, Physical Sciences and Mathematics, Tectonics and Structure

The variation of stress on faults is important for our understanding of fault friction and the dynamics of earthquake ruptures. However, we still have little observational constraints on their absolute magnitude, or their variations in space and in time over the seismic cycle. Here we use a new geodetic imaging technique to measure the 3D coseismic slip vectors along the 2019 Ridgecrest surface [...]

Bayesian inference on the initiation phase of the 2014 Iquique, Chile, earthquake

Cedric Twardzik, Zacharie Duputel, Romain Jolivet, et al.

Published: 2022-10-03
Subjects: Earth Sciences, Geophysics and Seismology, Physical Sciences and Mathematics

We investigate the initiation phase of the 2014 Mw8.1 Iquique earthquake in northern Chile. In particular, we focus on the month preceding the mainshock, a time period known to exhibit an intensification of the seismic and aseismic activity in the region. The goal is to estimate the time-evolution and partitioning of seismic and aseismic slip during the preparatory phase of the mainshock. To do [...]

Tsunami Early Warning from Global Navigation Satellite System Data using Convolutional Neural Networks

Donsub Rim, Robert Baraldi, Christopher M Liu, et al.

Published: 2022-09-29
Subjects: Earth Sciences, Geophysics and Seismology, Hydrology, Oceanography

We investigate the potential of using Global Navigation Satellite System (GNSS) observations to directly forecast full tsunami waveforms in real time. We train convolutional neural networks (CNNs) to use less than 9 minutes of GNSS data to forecast the full tsunami waveforms over 6 hours at select locations, and obtain accurate forecasts on a test dataset. Our training and test data consists of [...]

Complex evolution of the 2016 Kaikoura earthquake revealed by teleseismic body waves

Kenta Ohara, Yagi Yuji, Shinji Yamashita, et al.

Published: 2022-09-23
Subjects: Physical Sciences and Mathematics

The 2016 Kaikoura earthquake, New Zealand, ruptured more than a dozen faults, making it difficult to prescribe a model fault for analysing the event by inversion. To model this earthquake from teleseismic records, we used a potency density tensor inversion, which projects multiple fault slips onto a single model fault plane, which reduced the non-uniqueness due to the uncertainty in selecting the [...]

Rapid fault healing after seismic slip

John Bedford, Takehiro Hirose, Yohei Hamada

Published: 2022-09-01
Subjects: Earth Sciences, Geology, Geophysics and Seismology, Tectonics and Structure

Fault strength recovery (healing) following an earthquake is a key process in controlling the recurrence of future events; however, the rates and mechanisms of fault healing are poorly constrained. Here, by performing high-velocity friction experiments, we show that granite and gabbro fault gouges recover their strength rapidly after experiencing dynamic weakening during seismic slip. The healing [...]

Double surface rupture and hydraulic recharge of a three-fault system during the Mw 4.9 earthquake of 11 November 2019 at Le Teil (France)

André Burnol, Antoine Armandine Les Landes, Daniel Raucoules, et al.

Published: 2022-08-08
Subjects: Earth Sciences, Geophysics and Seismology, Hydrology, Numerical Analysis and Scientific Computing

The Mw 4.9 earthquake of 11 November 2019 at Le Teil (France) occurred at a very shallow depth (about 1 km) inducing the surface rupture of La Rouvière fault, nearby of a limestone quarry. Thanks to satellite differential interferometry, we detected the existence of the secondary surface rupture of the quasi-parallel Bayne Rocherenard fault. A newly processed seismic cross-section allowed us to [...]

Estimating the Occurrence of Slow Slip Events and Earthquakes with an Ensemble Kalman Filter

Hamed Ali Diab-Montero, Meng Li, Ylona van Dinther, et al.

Published: 2022-08-07
Subjects: Applied Mathematics, Earth Sciences, Physical Sciences and Mathematics

Our ability to forecast earthquakes and slow slip events is hampered by limited information on the current state of stress on faults. Ensemble data assimilation methods permit estimating the state by combining physics-based models and observations, while considering their uncertainties. We employ an Ensemble Kalman Filter (EnKF) to estimate shear stresses, slip rates, and the state theta acting [...]

A High-order Accurate Summation-by-Parts Finite Difference Method for Fully-dynamic Earthquake Sequence Simulations within Sedimentary Basins

Tobias Harvey, Brittany Angela Erickson, Jeremy Edward Kozdon

Published: 2022-08-06
Subjects: Applied Mathematics, Earth Sciences, Physical Sciences and Mathematics

We present a computationally efficient numerical method for earthquake sequences that incorporates wave propagation during rupture. A vertical strike-slip fault governed by rate-and-state friction is embedded in a heterogeneous elastic half-space discretized using a high-order accurate Summation-by-Parts finite difference method. We develop a two solver approach: Adaptive time-stepping is [...]

Within the subducting Nazca Plate: The 2020 Mw 6.8 Calama earthquake and its similarity with the surrounding inslab seismicity

Carlos Herrera, Francisco Pasten-Araya, Leoncio Cabrera, et al.

Published: 2022-08-06
Subjects: Earth Sciences, Geophysics and Seismology, Physical Sciences and Mathematics

We study the 2020 MW 6.8 Calama earthquake sequence that occurred within the subducting oceanic Nazca plate. The mainshock is modeled via waveform inversion using a dynamic rupture model, while detection and location techniques are used to better characterize its aftershock sequence. We analyze the local seismotectonic and thermal context of the subducting Nazca plate to understand the trigger [...]

Resolving minute temporal seismic velocity changes induced by earthquake damage: The more stations, the merrier ?

Luc Illien, Christoph Sens-Schönfelder, Kuan-Yu Ke

Published: 2022-07-29
Subjects: Earth Sciences, Geophysics and Seismology

Ground shaking induced by earthquakes often introduces transient changes in seismic velocity monitored with ambient noise. These changes are usually attributed to relaxation behavior following the co-seismic damage in the subsurface and are of relevance for postseismic hazard mitigation. However, the velocity evolution associated with this phenomenon can occur at very small timescales and [...]

Comparison of methods for coupled earthquake and tsunami modeling

Lauren S Abrahams, Lukas Krenz, Eric M Dunham, et al.

Published: 2022-07-09
Subjects: Geophysics and Seismology

Tsunami generation by offshore earthquakes is a problem of scientific interest and practical relevance, and one that requires numerical modeling for data interpretation and hazard assessment. Most numerical models utilize two-step methods with one-way coupling between separate earthquake and tsunami models, based on approximations that might limit the applicability and accuracy of the resulting [...]


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