A5018827178- earthquake and tectonic studies
- Seismology and Earthquake Studies
- Earthquake Detection and Analysis
- Geological and Geochemical Analysis
- High-pressure geophysics and materials
- Landslides and related hazards
- Seismic Imaging and Inversion Techniques
- Cryospheric studies and observations
- Geological formations and processes
- Adhesion, Friction, and Surface Interactions
- Industrial Vision Systems and Defect Detection
- Geology and Paleoclimatology Research
- Structural Response to Dynamic Loads
- Drilling and Well Engineering
- Winter Sports Injuries and Performance
- Geotechnical Engineering and Underground Structures
- Geophysical Methods and Applications
- Remote Sensing and LiDAR Applications
- Fault Detection and Control Systems
- Groundwater flow and contamination studies
- Seismic Waves and Analysis
- Geometric and Algebraic Topology
- Anomaly Detection Techniques and Applications
- Power Systems Fault Detection
Planetary Science Institute
2023-2024
Miller College
2023-2024
University of California, Berkeley
2023-2024
University of California, Santa Cruz
2018-2023
McGill University
2016-2018
Abstract On 4 and 6 July 2019, two large strike‐slip earthquakes with W ‐phase moment magnitudes M WW 6.5 (foreshock) 7.1 (mainshock) struck the Eastern California Shear Zone, northeast of Ridgecrest. The faulting geometry kinematic coseismic slip distribution both events are determined by jointly inverting seismological geodetic observations guided aftershock surface rupture locations. foreshock ruptured orthogonal faults a prominent L‐shaped maximum ~1.1 m on NE‐SW segment. mainshock...
Abstract The number of aftershocks increases with mainshock size following a well‐defined scaling law. However, excursions from the average behavior are common. This variability is particularly concerning for large earthquakes where varies by factors 100 mainshocks comparable magnitude. Do observable lead to differences in aftershock behavior? We examine productivity relative global all ( ) 1990 2019. A map earthquake highlights influence tectonic regimes. Earthquake depth, lithosphere age,...
Abstract Seismology is witnessing explosive growth in the diversity and scale of earthquake catalogs. A key motivation for this community effort that more data should translate into better forecasts. Such improvements are yet to be seen. Here, we introduce Recurrent Earthquake foreCAST (RECAST), a deep‐learning model based on recent developments neural temporal point processes. The enables access greater volume observations, overcoming theoretical computational limitations traditional...
Abstract Recognizing earthquakes as foreshocks in real time would provide a valuable forecasting capability. In recent study, Gulia and Wiemer (2019) proposed traffic-light system that relies on abrupt changes b-values relative to background values. The approach utilizes high-resolution earthquake catalogs monitor localized regions around the largest events distinguish foreshock sequences (reduced b-values) from aftershock (increased b-values). well-recorded Ridgecrest, California, Maria...
Abstract Recent earthquakes have demonstrated that rupture may propagate through geometrically complex networks of faults. Ancient exhumed faults the potential to reveal details at seismogenic depths. We present a new set field observational criteria for determining which population pseudotachylyte fault veins formed in same earthquake and apply it map representing single earthquakes. An exceptional exposure an ancient strand Norumbega Shear Zone preserves evidence multistranded deep zone...
Abstract Propagating earthquakes must overcome geometrical complexity on fault networks to grow into large, surface rupturing events. We map step‐overs, bends, gaps, splays, and strands of length scales ∼100–500 m from the ruptures 31 strike‐slip earthquakes, recording whether propagated past feature. find that step‐overs bends can arrest rupture develop a statistical model for passing probability as function geometry each group. Step‐overs wider than 1.2 km, single larger 32°, double 38°...
Abstract Previous field observations suggest that fault slip surface roughness may decrease with slip. However, measurements have yet to confidently isolate the effect of from other possible controls, such as lithology or tectonic setting. We describe evolution surfaces in normal faults SE Utah cut well‐sorted, high‐porosity sandstones and accommodated regional extension at 1‐ 4‐km depth. Tight controls on offset uniform history allowed us during early stages faulting (0‐ 55‐m slip). Slip...
Abstract Gulia and Wiemer (2019; hereafter, GW2019) proposed a near-real-time monitoring system to discriminate between foreshocks aftershocks. Our analysis (Dascher-Cousineau et al., 2020; hereinater, DC2020) tested the sensitivity of Foreshock Traffic-Light System output parameter choices left expert judgment for 2019 Ridgecrest Mw 7.1 2020 Puerto Rico 6.4 earthquake sequences. In accompanying comment, (2021) suggest that at least six different methodological deviations lead...
Three decades of geodetic monitoring have established slow slip events (SSEs) as a common mode fault slip, sometimes linked with earthquake swarms and in few cases escalating to major seismic events. However, the connection between SSEs hazard has been difficult quantify contextualize beyond regional studies. We aggregate record from subduction zones circum-Pacific region. In aggregate, rates increase up threefold concurrent proximal SSEs. The relative amplitude this is correlated SSE size...
Successive earthquakes can drive landscape evolution. However, the mechanism and pace with which landscapes respond remain poorly understood. Offset channels in Carrizo Plain, California, capture fluvial response to lateral slip on San Andreas Fault millennial time scales. We developed tested a model that quantifies competition between fault slip, elongates channels, aggradation, causes channel infilling and, ultimately, abandonment. Validation of this supports transport-limited implies...
Abstract Co‐located and integrated observation of the surface subsurface is necessary to characterize fault zone hydrogeology. The spectacular cliff‐face exposure Champlain Thrust at Lone Rock Point, Vermont, a nearby well‐field site provides opportunity for co‐located structural hydrogeologic field observations. We mapped prominent features discrete groundwater seeps in outcrop, also drilled through near outcrop determined aquifer parameters from pumping tests. In core thickness varies on...
Earthquake magnitude is controlled by the rupture area of fault network hosting event. For surface-rupturing large strike-slip earthquakes (~MW6+), ruptures must overcome zones geometrical complexity along networks. These zones, or earthquake gates, act as barriers to propagation. We map step-overs, bends, gaps, splays, and strands from surface 31 earthquakes, classifying each population into breached unbreached groups. develop a statistical model for passing probability function geometry...
Ice mass loss from the Greenland Sheet and Arctic glaciers has accelerated over last three decades due to rapid changes in climate. This of ice glaciated areas redistribution water across global oceans creates a complex spatio-temporal pattern crustal deformation load on Earth’s surface. We test whether resulting strain perturbations this are large enough influence seismic activity decade century timescales. Using new ice-mass-loss estimates radar altimetry for model...