Laboratory experiments report that detectable seismic velocity changes should occur in the vicinity of fault zones prior to earthquakes. However, operating permanent active sources monitor natural faults at seismogenic depth is found be nearly impossible achieve. We show noise generated by vehicle traffic, and especially heavy freight trains, can turned into a powerful repetitive source continuously probe Earth's crust few kilometers depth. Results an exploratory experiment Southern...

Research Article| December 20, 2017 Fast Matched Filter (FMF): An Efficient Seismic Matched‐Filter Search for Both CPU and GPU Architectures Eric Beaucé; Beaucé aDepartment of Earth, Atmospheric, Planetary Sciences, Massachusetts Institute Technology, 77 Avenue, 54‐527, Cambridge, 02139 U.S.A., ebeauce@mit.edu other works by this author on: GSW Google Scholar William B. Frank; Frank Alexey Romanenko bChair Informatics Systems, Novosibirsk State University, Pirogova, 2, 630090, Russia Author...

Continuous seismograms contain a wealth of information with large variety signals different origin. Identifying these is crucial step in understanding physical geological objects. We propose strategy to identify classes continuous single-station an unsupervised fashion. Our relies on extracting meaningful waveform features based deep scattering network combined independent component analysis. Based the extracted features, agglomerative clustering then groups waveforms hierarchical fashion...

Abstract Earth's crust is continuously subjected to oscillatory stress perturbations due the solid Earth and ocean tides. The seismic response such modulations carries information on earthquake physics crustal properties. Experimental observational studies suggested but could not demonstrate that strength of tidal modulation seismicity increases before large earthquakes. We tested this hypothesis by (a) developing a new, comprehensive 10‐year long catalog preceding 6 July 2019 magnitude 7.1...

Understanding rupture mechanisms, seismicity propagation, distribution, and migration after a major earthquake relies on the quality of catalogs, particularly their detection capabilities, location accuracy, magnitude completeness. On February 27, 2010, Mw 8.8 struck Maule region in south-central Chile, causing widespread damage substantial loss life. As largest well-instrumentally recorded this event offers unique opportunity to revisit an old dataset, refine aftershock sequence analysis,...

We re-examine the aftershock sequence of Mw 8.8 Maule earthquake in south-central Chile using deep learning on 10 months continuous seismic data from 156 temporary stations along rupture zone (March 2010–March 2011). By integrating back-projection and matched filtering with PhaseNet (a deep-learning phase picker), we initially identify 99,137 earthquakes. then relocate these events NonLinLoc source-specific station terms waveform coherence. select a subset 8,894 earthquakes for template...

Abstract We present a new automated earthquake detection and location method based on beamforming (or back projection) template matching apply it to study the seismicity of Southwestern Alps. use with prior knowledge 3‐D variations seismic velocities as first run search for earthquakes that are used templates in subsequent matched‐filter search. Template allows us detect low signal‐to‐noise ratio events thus obtain high spatiotemporal resolution describe how we address problem false...

Abstract The 17 August 1999 M w 7.4 Izmit earthquake ruptured the western section of North Anatolian Fault Zone and strongly altered fault zone properties stress field. Consequences co‐ post‐seismic changes were seen in spatio‐temporal evolution seismicity surface slip rates. Thirteen years after earthquake, 2012, seismic network Dense Array for Anatolia (DANA) was deployed 1.5 years. We built a new catalog microseismicity ( < 2) by applying our automated detection location method to DANA...

Abstract Inversions of earthquake focal mechanisms are among the most accessible and reliable methods for determining crustal stress. However, use this method varies widely, assumptions that underpin it often violated, potentially compromising stress estimates. We investigate consequences violating little-studied assumption have diverse orientations. Our approach is to employ data-informed synthetic mechanisms, with nodal plane orientations defined by recent lineaments in Midland Basin,...

Abstract In subduction zones, along‐strike and downdip variations in megathrust slip behavior are linked to changes properties of the subducting overriding plates. Although marine geophysical methods provide insights into zone structures, most surveys consist sparse 2D profiles, limiting our understanding first‐order controls. Here, we use active‐source seismic data derive a 3D crustal‐scale P‐wave velocity model Alaska Peninsula that encompasses both plates spans Semidi segment SW Kodiak...

Abstract Foreshocks in the form of microseismicity are among most powerful tools to study physical processes that occur before main earthquakes. However, their detection and precise characterization is still sparse, especially for small-to-moderate-size earthquakes (Mw<6). We present here a detailed foreshock analysis 7 November 2019, Balsorano, Italy, normal fault earthquake (Mw 4.4). To improve after mainshock, we use six three-component broadband receivers at distances less than 75...

ABSTRACT Earthquake focal mechanism data provide information about the stress state at origin of earthquakes. The inversion methods that are commonly used to infer tensor from mechanisms have varying complexity but always rely on a number assumptions. We present an iterative method built upon classic linear allows for relaxing assumption shear magnitudes while preserving computational simplicity problem. Every iteration our computes least-squares solution problem, which makes fast enough...

Abstract We introduce BPMF (backprojection and matched filtering)—a complete fully automated workflow designed for earthquake detection location, distributed in a Python package. This enables the creation of comprehensive catalogs with low magnitudes completeness using no or little prior knowledge study region. uses seismic wavefield backprojection method to construct an initial catalog that is then densified filtering. integrates recent machine learning tools complement physics-based...

Foreshocks are among the most powerful tools to study processes that occur before main earthquakes. However, their detection is still sparse, especially for relatively small We present here a detailed foreshock analysis 2019 Balsorano (Italy) earthquake (Mw4.4). To improve and after mainshock, we use receivers at distances of <75 km from targeted seismicity, through template matching. understanding mechanism(s) behind initiation, detail evolution sequence associated this earthquake, using...

Intraplate regions commonly host energetic earthquakes on less-prominent fault zones, raising questions how structure may influence intraplate seismogenesis. Here, we investigate the causative of strongly-felt April 5, 2024 Mw4.8 New Jersey Earthquake which occurred near misoriented 300-km long Ramapo Fault. Field mapping ancient fracture networks reveals that up-dip projection relocated aftershocks is co-located with a previously unmapped zone striking parallel to mainshock's nodal plane,...

Earth and Space Science Open Archive This work has been accepted for publication in Journal of Geophysical Research - Solid Earth. Version RecordESSOAr is a venue early communication or feedback before peer review. Data may be preliminary. Learn more about preprints. preprintOpen AccessYou are viewing an older version [v1]Go to new versionHierarchical exploration continuous seismograms with unsupervised learningAuthorsReneSteinmanniDLeonardSeydouxiDEricBeaucéMichelCampilloSee all authors...