Preprints
Search for earthquake (434 results)
Rapid earthquake-tsunami modeling: The multi-event, multi-segment complexity of the 2024 Mw 7.5 Noto Peninsula Earthquake governs tsunami generation
Published: 2024-04-13
Subjects: Geophysics and Seismology
The January 1st, 2024, moment magnitude (Mw) 7.5 Noto Peninsula earthquake ruptured in complex ways, challenging timely analysis of the tsunami generation. We present rapid and accurate tsunami models informed by a 6-subevent centroid moment tensor (CMT) model that we obtain by inverting teleseismic and strong motion data and validation against geodetic observations. We identify two distinct [...]
Sentinel-1 SAR-based Globally Distributed Landslide Detection by Deep Neural Networks
Published: 2024-04-05
Subjects: Artificial Intelligence and Robotics, Geomorphology
Efficient response to large and widespread multiple landslide events (MLEs) demands rapid and effective landslide detection. Despite extensive efforts using optical remotely sensed imagery, limitations in global, day & night, and all-weather operational capabilities remain. To address these gaps, we introduce an approach that harnesses Deep Neural Networks (DNNs) and Synthetic Aperture Radar [...]
Coral Ba/Ca reflected the past earthquake and tsunami on Kikai Island in 1911
Published: 2024-03-18
Subjects: Geochemistry
Natural disasters like earthquakes and tsunamis significantly affect coral reefs and marine ecosystems. The Ryukyu Islands, including Kikai Island and the surrounding coral reefs, face the potential risk of experiencing a significant earthquake with Mw > 8. While historical records offer insights into past tsunami occurrences, there is scarce observation or quantitative data on the impacts of [...]
Spatiotemporal forecast of extreme events in a dynamical model of earthquake sequences
Published: 2024-03-18
Subjects: Earth Sciences
Seismic (‘earthquakes’) and aseismic (‘slow earthquakes’) slip events result from episodic slips on faults and are often chaotic due to stress heterogeneity. Their predictability in nature is a widely open question. Here, we forecast extreme events in a numerical model of a single fault governed by rate-and-state friction, which produces realistic sequences of slow events with a wide range of [...]
Brittle origin of off-fault fractures during the 2019 Ridgecrest earthquake sequence
Published: 2024-03-14
Subjects: Earth Sciences, Geophysics and Seismology, Tectonics and Structure
According to the classical Mohr-Coulomb-Anderson theory, faults form at an angle from the largest regional compressive stress that is approximately 30° for most rocks. However, real settings are more complex and faults often present orientations inconsistent with the angles predicted by the classical theory applied to the present-day regional stress field. The Ridgecrest region hosts a young [...]
A Multiplex Rupture Sequence under Complex Fault Network due to Preceding Earthquake Swarms during the 2024 Mw 7.5 Noto Peninsula, Japan, Earthquake
Published: 2024-03-14
Subjects: Geophysics and Seismology
A devastating earthquake with moment magnitude 7.5 occurred in the Noto Peninsula, central Japan. We estimate the rupture evolution of this earthquake from teleseismic P-wave data using the potency-density tensor inversion method, which can give spatiotemporal slip distribution including the information on fault orientations. The result shows a long and quiet initial rupture phase, which overlaps [...]
Assessing the Earthquake Recording Capability of an Ocean-bottom Distributed Acoustic Sensing Array in the Sanriku region, Japan
Published: 2024-03-07
Subjects: Physical Sciences and Mathematics
Sparse seismic instrumentation in the oceans limits our understanding of the Earth’s dynamics. The emerging technology of Distributed Acoustic Sensing (DAS), which can turn existing fiber-optic cable arrays into thousands of seismic sensors, has the potential to fill the data gap. Yet, the power of OBDAS for routine seismic monitoring has to be further explored. In this study, we investigate the [...]
Sediment Corrections for Distributed Acoustic Sensing
Published: 2024-03-06
Subjects: Physical Sciences and Mathematics
On continental margins, sediments cause significant and spatially variable delays in seismic phase arrival times. The strong impedance contrast of the sediment-bedrock interface causes P-wave splitting that is clearly seen on Distributed Acoustic Sensing recordings of earthquakes, resulting in additional phase arrivals that must be picked separately. We introduce sediment corrections to correctly [...]
The effects of precursory velocity changes on earthquake nucleation and stress evolution in dynamic earthquake cycle simulations
Published: 2024-02-21
Subjects: Physical Sciences and Mathematics
Seismic velocity changes in earthquake cycles have been observed over a wide range of timescales and may be a good indicator of the onset of future earthquakes. Understanding the effects of precursory velocity changes right before seismic and slow-slip events could potentially elucidate the onset and timing of fault failure. We use numerical models to simulate fully dynamic earthquake cycles in [...]
Mechanisms and seismological signatures of rupture complexity induced by fault damage zones in fully-dynamic earthquake cycle models
Published: 2024-02-10
Subjects: Civil and Environmental Engineering, Earth Sciences, Engineering, Physical Sciences and Mathematics
Damage zones are common around faults, but their effects on earthquake mechanics are still incompletely understood. Here, we investigate how damage affects rupture patterns, source time functions and ground motions in 2D fully-dynamic cycle models. We find that back-propagating rupture fronts emerge in large faults and can be triggered by residual stresses left by previous ruptures or by [...]
Azimuthal Variation in the Spectra of the 2019 Ridgecrest Earthquake Clusters and its Application to Understanding Fault Zone Structure
Published: 2024-02-08
Subjects: Physical Sciences and Mathematics
We first show through dynamic rupture models that FDZs can amplify high-frequency waves along directions close to fault strike and the amplified frequency band may be used to estimate the width and velocity contrast of the FDZ. Then, we identify this high-frequency amplification in the spectra of M1.5–3 earthquakes from the 2019 Ridgecrest earthquake sequence. We cluster the earthquakes by [...]
Possible Mechanisms for Tsunami-like Surge Deposits Due to the Chicxulub Impact at the K-Pg Boundary at the Tanis Site, North Dakota
Published: 2024-02-02
Subjects: Physical Sciences and Mathematics
At Tanis, a unique bi-directional sediment package occurs precisely at the Cretaceous-Paleogene (KPg) boundary, recording the first hours of the Paleogene in uncommonly fine temporal detail. The impact ejecta-bearing sediment package was rapidly emplaced by two massive, ~10-meter-high, potentially impact-triggered surges, that inundated a steep, deeply incised paleo river valley from the [...]
Distributed Acoustic Sensing for aftershock monitoring: the case of the 2019 Mw 4.9 Le Teil earthquake
Published: 2024-01-30
Subjects: Geophysics and Seismology
Recent developments in Distributed Acoustic Sensing (DAS) have greatly expanded our capabilities for dense geophysical instrumentation by tapping into existing (but unused) fibre-optic telecommunication networks. Leveraging these so-called "dark fibres" permits an extremely rapid deployment of thousands of vibration sensors over distances of several tens of kilometres, which is ideal for rapid [...]
Unsupervised Structural Damage Assessment from Space using the Segment Anything Model (USDA-SAM): A Case Study of the 2023 Türkiye Earthquake
Published: 2024-01-23
Subjects: Computer Sciences, Earth Sciences, Engineering, Environmental Sciences
This paper explores advanced deep learning methods, specifically utilising the Segment Anything Model (SAM) along with image processing techniques, to evaluate the structural damages caused by the devastating earthquake that occurred in Turkey on February 6, 2023. Leveraging exceptionally high-resolution pre- and post-disaster imagery provided by Maxar Technologies, this paper showcases the [...]
Transient aseismic vertical deformation across the Pisia-Skinos normal fault (Gulf of Corinth, Greece)
Published: 2024-01-18
Subjects: Earth Sciences, Geophysics and Seismology, Tectonics and Structure
Geodetically-derived deformation rates are sometimes used to infer seismic hazard, implicitly assuming that short-term (annual-decadal) deformation is representative of longer-term deformation. This is despite geological observations indicating that deformation/slip rates are variable over a range of timescales. Using geodetic data from 2016-2021, we observe an up to 7-fold increase in vertical [...]