Abstract Earthquake signal detection and seismic phase picking are challenging tasks in the processing of noisy data monitoring microearthquakes. Here we present a global deep-learning model for simultaneous earthquake picking. Performing these two related tandem improves performance each individual task by combining information phases full waveform signals using hierarchical attention mechanism. We show that our outperforms previous traditional phase-picking algorithms. Applying to 5 weeks...

Abstract We employ 130 low‐frequency earthquake (LFE) templates representing tremor sources on the plate boundary below southern Vancouver Island to examine LFE magnitudes. Each template is assembled from hundreds thousands of individual LFEs, over 269,000 independent detections major episodic‐tremor‐and‐slip (ETS) events between 2003 and 2013. Template displacement waveforms for direct P S waves at near epicentral distances are remarkably simple many stations, approaching zero‐phase, single...

Abstract On August 9, 2020, an M w 5.1 earthquake ruptured the uppermost crust near town of Sparta, North Carolina, creating first co-seismic faulting surface rupture documented in Eastern United States. Combining deep learning and matched filter detection, with differential-travel times relocation, we obtain a catalog 1761 earthquakes, about 5.8 number events listed standard USGS/NEIC catalog. The relocated seismicity revealed complex fault structure distinct planar alignments, supported by...

Abstract An unusual earthquake swarm began in December 2021 between the towns of Elgin and Lugoff South Carolina, United States. This area is characterized by historically low seismicity, but April 2024 it has experienced 97 small earthquakes listed U.S. Geological Survey (USGS) catalog, presenting a unique opportunity to investigate dynamics swarms stable continental regions. These events are located north–south diffuse trend, cross cutting East Piedmont fault system, Late Paleozoic dextral...

Research Article| July 01, 2017 Plateau subduction, intraslab seismicity, and the Denali (Alaska) volcanic gap Lindsay Chuang; Chuang 1Department of Earth, Ocean Atmospheric Sciences, University British Columbia, 2020-2207 Main Mall, Vancouver, BC V6T 1Z4, Canada Search for other works by this author on: GSW Google Scholar Michael Bostock; Bostock Aaron Wech; Wech 2Alaska Volcano Observatory, U.S. Geological Survey, 4230 Drive, Anchorage, Alaska 99508, USA Alexandre Plourde Author Article...

Abstract Recent studies suggested that transient and long‐term stress changes caused by Earth's surface processes (e.g., extreme weather events, annual variations on groundwater storages) can affect earthquake activities in the subsurface. However, these may be limited completeness of standard catalogs, especially during or right after events. Here we apply template matching method to build a more complete catalog Taiwan spanning seven months before 12 2009 typhoon Morakot, which brought...

Abstract We conduct a detailed study of the foreshock sequence preceding 2010 M w 6.7 Yushu, Qinghai earthquake in Tibetan plateau by examining continuous waveforms recorded at seismic station near mainshock rupture zone. By using deep learning phase picker—EQTransformer and matched‐filter technique, we identify 120 foreshocks with magnitude ranging from −0.7 to 1.6, starting 4.6 approximately 2 hr before Yushu mainshock. Our analyses show that follows typical Omori's law decay p ‐value 0.73...

Abstract Deep‐seated tectonic tremors have been regarded as an observation tied to interconnected fluids at depth, which well documented in worldwide subduction zones and transform faults but not a collisional mountain belt. In this study we explore the general features of Taiwan discuss possible generation mechanism. 4 year data, find 231 ambient tremor episodes with durations ranging from 5 30 min. addition coseismic slip‐induced stress change nearby major earthquake, increased rate is...

An unusual earthquake swarm began in December 2021 between the towns of Elgin and Lugoff South Carolina, United States. This area is characterized by historically low seismicity, but April 2024 it has experienced 97 small earthquakes listed USGS catalog, presenting a unique opportunity to investigate dynamics swarms stable continental regions. These events are located north-south diffuse trend, cross-cutting Eastern Piedmont Fault System (EPFS), Late Paleozoic dextral strike-slip fault,...

In the presence of background noise, arrival times picked from a surface microseismic data set usually include number false picks that can lead to uncertainty in location estimation. To eliminate and improve accuracy estimates, we develop an association algorithm termed RANSAC-based Arrival Time Event Clustering (RATEC) clusters into event groups based on random sampling fitting moveout curves approximate hyperbolas. far fitted hyperbolas are classified as removed prior Simulations synthetic...

Abstract On August 9, 2020, an M w 5.1 earthquake ruptured the uppermost crust near town of Sparta, North Carolina. The generated a ~2 km-long surface rupture, first co-seismic faulting rupture identified in Eastern United States. Combining deep learning phase picking, and matched filter detection, with differential-travel times relocation, we obtain catalog 1761 earthquakes high-resolution locations, about 5.8 number events listed standard NEIC catalog. Our results show Sparta mainshock has...

T waves excited by earthquakes propagate along the SOFAR channel with low transmission loss, and therefore can be recorded on land-based seismic stations hydrophones located thousands of kilometers away from earthquake epicenters. Early T-wave observations are mostly based recordings due to mechanics energy conversion acoustic into phases. Recently, signals have also been detected ocean-bottom seismometers (OBSs) at deep ocean basin offshore eastern Taiwan, raising question how environment...

In the presence of background noise, arrival times picked from a surface microseismic data set usually include number false picks that can lead to uncertainty in location estimation. To eliminate and improve accuracy estimates, we develop an association algorithm termed RANSAC-based Arrival Time Event Clustering (RATEC) clusters into event groups based on random sampling fitting moveout curves approximate hyperbolas. far fitted hyperbolas are classified as removed prior Simulations synthetic...