A5070330870- earthquake and tectonic studies
- Seismology and Earthquake Studies
- Geological and Geochemical Analysis
- High-pressure geophysics and materials
- Earthquake Detection and Analysis
- Seismic Waves and Analysis
- Seismic Imaging and Inversion Techniques
- Geological and Geophysical Studies
- Geophysics and Gravity Measurements
- Seismic Performance and Analysis
- GNSS positioning and interference
- Structural Health Monitoring Techniques
- Geochemistry and Geologic Mapping
- Geological and Geophysical Studies Worldwide
- Drilling and Well Engineering
- Hydraulic Fracturing and Reservoir Analysis
- Elasticity and Material Modeling
- Geological Modeling and Analysis
- Landslides and related hazards
- Structural Response to Dynamic Loads
- Geological formations and processes
- Reservoir Engineering and Simulation Methods
- Earthquake and Tsunami Effects
- Geotechnical and Geomechanical Engineering
- Remote Sensing and Land Use
Indiana University Bloomington
2014-2025
Indiana University – Purdue University Indianapolis
2024
Indiana University
2009-2023
Charles River Laboratories (Netherlands)
2019-2022
University of California, Berkeley
2006-2021
Nanyang Technological University
2021
Wright-Patterson Air Force Base
2019
John Wiley & Sons (United States)
2014-2015
Hanover College
2015
Stanford University
2001-2005
The 2014 Working Group on California Earthquake Probabilities (WGCEP14) present the time‐independent component of Uniform Rupture Forecast, Version 3 (UCERF3), which provides authoritative estimates magnitude, location, and time‐averaged frequency potentially damaging earthquakes in California. primary achievements have been to relax fault segmentation include multifault ruptures, both limitations UCERF2. rates all are solved for simultaneously from a broader range data, using system‐level...
The 2014 Working Group on California Earthquake Probabilities (WGCEP 2014) presents time-dependent earthquake probabilities for the third Uniform Rupture Forecast (UCERF3). Building UCERF3 time-in- dependent model published previously, renewal models are utilized to represent elastic- rebound-implied probabilities. A new methodology has been developed that solves applicability issues in previous approach unsegmented models. meth- odology also supports magnitude-dependent aperiodicity and...
The US National Seismic Hazard Model (NSHM) was updated in 2023 for all 50 states using new science on seismicity, fault ruptures, ground motions, and probabilistic techniques to produce a standard of practice public policy other engineering applications (defined return periods greater than ∼475 or less ∼10,000 years). Changes time-independent seismic hazard (both increases decreases compared previous NSHMs) are substantial because the model considers more data earthquake rupture forecasts...
ABSTRACT A seismicity rate model (SRM) has been developed as part of the 2022 Aotearoa New Zealand National Seismic Hazard Model revision. The SRM consists many component models, each which falls into one two classes: (1) inversion fault (IFM); or (2) distributed (DSM). Here we provide an overview and a brief description models. upper plate IFM forecasts occurrence for hundreds thousands potential ruptures derived from Community Fault version 1.0 utilizing either geologic- geodetic-based...
In this report we present the time-independent component of Uniform California Earthquake Rupture Forecast, Version 3 (UCERF3), which provides authoritative estimates magnitude, location, and time-averaged frequency potentially damaging earthquakes in California. The primary achievements have been to relax fault segmentation assumptions include multifault ruptures, both limitations previous model (UCERF2). rates all are solved for simultaneously, from a broader range data, using system-level...
Abstract In inversion of geodetic data for spatial distribution fault slip under smoothing and positivity constraints, subjective or incorrect techniques are often employed to select a parameter that determines the relative weight placed on fitting versus distribution. A popular objective method based Akaike’s Bayesian information criterion (ABIC) is if constraints employed. We introduce fully probabilistic simultaneously estimate objectively correctly in framework. The complete solution...
Abstract GPS time series in northeast Japan exhibit nonlinear trends from 1996 to 2011 before the M w 9.0, Tohoku‐oki earthquake. After removing reference frame noise, we model as linear plus constant acceleration, correcting for coseismic and postseismic effects numerous ∼ 6.5+ earthquakes during this period. We find spatially coherent statistically significant accelerations throughout northern Honshu. Large areas of outside Tohoku region show insignificant accelerations, demonstrating that...
[1] To characterize the present-day vertical displacement field in active Taiwan orogenic belt, 1843 precise leveling and 199 continuous GPS measurements from 2000 to 2008 are collected analyzed this study. Vertical velocities derived data placed a reference frame of Chinese continental margin using observations at nearby sites. The generally reveal dome-shaped pattern with uplift ∼0.2–18.5 mm/yr interior mountain range subsidence on flanks mountains coastal plains. Modern rates fold thrust...
Research Article| July 12, 2017 A Synoptic View of the Third Uniform California Earthquake Rupture Forecast (UCERF3) Edward H. Field; Field aU.S. Geological Survey, Denver Federal Center, P.O. Box 25046, MS‐966, Denver, Colorado 80225‐0046 U.S.A., field@usgs.gov Search for other works by this author on: GSW Google Scholar Thomas Jordan; Jordan bUniversity Southern California, 3651 Trousdale Parkway Number 169, Los Angeles, 90089‐0742 Morgan T. Page; Page cU.S. 525 S. Wilson Avenue, Pasadena,...
Abstract The 2022 revision of Aotearoa New Zealand National Seismic Hazard Model (NZ NSHM 2022) has involved significant all datasets and model components. In this article, we present a subset many results from the as well an overview governance, scientific, review processes followed by NZ team. calculated hazard increased for most when compared with previous models. models are available online.
ABSTRACT We present the 2023 U.S. Geological Survey time-independent earthquake rupture forecast for conterminous United States, which gives authoritative estimates of magnitude, location, and time-averaged frequency potentially damaging earthquakes throughout region. In addition to updating virtually all model components, a major focus has been provide better representation epistemic uncertainties. For example, we have improved multifault ruptures, both in terms allowing more less fault...
GPS measurements of coseismic displacements from the 1999, Chi‐Chi, Taiwan earthquake are modeled using elastic dislocation theory. We find that a single fault plane cannot fit data, but rather curved surface consisting multiple segments dipping 20–25° best fits observations. The model exhibits reverse and left‐lateral slip on 75 km long N‐S trending segment right‐lateral 25 E‐W at northern end rupture. 21° is inconsistent with previous interpretations high angle tear faulting.
The abundance of geodetic and seismic data recording postseismic deformation following the 2004 Parkfield earthquake provides an unprecedented opportunity to resolve frictional properties on section San Andreas fault. segment is a transition between locked southeast that last ruptured in 1857 Fort Tejon creeping northwest. We develop three-dimensional rate- state-dependent friction models afterslip investigate behavior It assumed coseismic rupture occurred area fault surrounded by aseismic...
Abstract In Southern California, slip rates derived from geodesy-constrained elastic models are lower than geologic along the Mojave and San Bernardino segments of Andreas fault Garlock fault. contrast, summed geodetic rate across eastern California shear zone (ECSZ) is significantly higher rate. We show that in can be reconciled using a viscoelastic earthquake cycle model explicitly incorporates time-dependent deformation due to nonsteady interseismic creep crust viscous flow upper mantle....
We present a unified theoretical framework and solution method for probabilistic, Bayesian inversions of crustal deformation data. The involve multiple data sets with unknown relative weights, model parameters that are related linearly or non-linearly through theoretic models to observations, prior information on regularization priors stabilize underdetermined problems. To efficiently handle non-linear in which some the this combines both analytical least-squares solutions Monte Carlo...
Abstract A decadal‐scale deformation transient preceding the 2011 M w 9 Tohoku‐oki, Japan, earthquake was reported from continuous GPS data and interpreted as accelerating aseismic slip on Japan Trench megathrust. Given unprecedented nature of this transient, independent confirmation is required. Here we show that changes in recurrence intervals repeating earthquakes megathrust period 1996 to are consistent with Tohoku‐oki earthquake. All sequences statistically significant trends interval...
Abstract The potential for future earthquakes on faults is often inferred from inversions of geodetically derived surface velocities locking using kinematic models such as block models. This can be challenging in complex deforming zones with many closely spaced or where deformation not readily described motions. Furthermore, strain rates are more directly related to coupling than velocities. We present a methodology estimating slip deficit rate and apply it New Zealand the purpose...
We develop a two‐dimensional boundary element earthquake cycle model including deep interseismic creep on vertical strike‐slip faults in an elastic lithosphere coupled to viscoelastic asthenosphere. Uniform slip the upper part of fault is prescribed periodically represent great earthquakes. Below coseismic rupture creeps response lithospheric shear stresses within narrow linear viscous zone. The applied GPS contemporary velocity field across Carrizo Plain and northern San Francisco Bay...
Models of postseismic deformation following the 2002 M 7.9 Denali Fault, Alaska earthquake provide insight into rheologic structure Alaskan lithosphere and physical processes activated a large earthquake. We model coseismic GPS displacements 4 yr position time-series with coupled afterslip on fault in distributed viscous flow asthenosphere. Afterslip is assumed to be governed by simplified version laboratory-derived rate-strengthening friction law that characterized single parameter, σ(a −...
Prior to the 2011 M9 Tohoku‐oki earthquake, subduction at Japan Trench was characterized by M7‐8 earthquakes, sometimes rupturing same source regions (seismic asperities), followed extensive afterslip detected GPS measurements. A physically‐based model consisting of velocity‐weakening asperities surrounded aseismic creep on velocity‐strengthening (the ‘rate‐state asperity model’) became prevailing conceptual for earthquakes in this region. Theory and numerical simulation indicates that areas...
[1] The 2003 magnitude 6.5 San Simeon and the 2004 6.0 Parkfield earthquakes induced small, but significant, static stress changes in lower crust on central Andreas fault, where recently detected tectonic tremor sources provide new constraints deep fault creep processes. We find that these affect rates very differently, consistent with their differing transferred shear stresses. event appears to have cast a "stress shadow" north of Parkfield, activity was stifled for 3–6 weeks. In contrast,...
[1] We characterize the kinematics of modern crustal deformation in Taiwan and evaluate potential for large earthquakes by computing tectonic block motions fault slip rates from 531 GPS horizontal velocities. These new velocity field indicates that lateral extrusion southern transition collision to subduction is primarily achieved motion along several major reverse faults internal distortion blocks. The northern characterized asymmetric opening Okinawa trough collision-induced rotation...
In Southern California, fault slip rate estimates along the San Andreas (SAF) and Garlock from geodetically constrained kinematic models are systematically at low end or lower than geologic estimates. The sum of geodetic model rates across eastern California shear zone is higher sum. However, ranges reported in literature sufficiently large that it remains unclear whether these apparent discrepancies real attributable to epistemic uncertainties two types We further examine derived on major...