A5048107638- earthquake and tectonic studies
- Seismic Waves and Analysis
- Seismology and Earthquake Studies
- Seismic Imaging and Inversion Techniques
- Geological and Geochemical Analysis
- High-pressure geophysics and materials
- Earthquake Detection and Analysis
- Landslides and related hazards
- Rock Mechanics and Modeling
- Drilling and Well Engineering
- Geology and Paleoclimatology Research
- Geophysics and Sensor Technology
- Geological Modeling and Analysis
- Methane Hydrates and Related Phenomena
- Groundwater flow and contamination studies
- Geological and Geophysical Studies
- Hydraulic Fracturing and Reservoir Analysis
- Hydrocarbon exploration and reservoir analysis
- Geophysical Methods and Applications
- Geophysical and Geoelectrical Methods
- Cryospheric studies and observations
- Geotechnical and Geomechanical Engineering
- Geochemistry and Geologic Mapping
- Seismic Performance and Analysis
- Atmospheric and Environmental Gas Dynamics
Victoria University of Wellington
2016-2025
Stanford University
1999-2021
Victoria University
2020
Medical Research Council
2011
Worthing Hospital
2011
University of Aberdeen
1995-2005
GNS Science
1997-1999
Lancaster University
1993-1995
Research Article| May 01, 2000 How faulting keeps the crust strong John Townend; Townend 1Department of Geophysics, Stanford University, Stanford, California 94305-2215, USA Search for other works by this author on: GSW Google Scholar Mark D. Zoback Geology (2000) 28 (5): 399–402. https://doi.org/10.1130/0091-7613(2000)28<399:HFKTCS>2.0.CO;2 Article history received: 16 Aug 1999 rev-recd: 07 Feb accepted: 15 first online: 02 Jun 2017 Cite View This Citation Add to Manager Share Icon Facebook...
We present the first New Zealand-wide study of surface wave dispersion, using ambient noise observed at 42 broad-band stations in national seismic network (GeoNet) and Global Seismic Network (GSN). Year-long vertical-component time-series recorded between 2005 April 1 2006 March 31 have been correlated with one another to yield estimated fundamental mode Rayleigh Green's functions. filter these functions compute group dispersion curves periods 5–50 s, a phase-matched filter, frequency-time...
ABSTRACT On the afternoon of 15 November 2017, coastal city Pohang, Korea, was rocked by a magnitude 5.5 earthquake (Mw, U.S. Geological Survey). Questions soon arose about possible involvement in Republic Korea’s first enhanced geothermal system (EGS) project because epicenter located near project’s drill site. The Pohang EGS intended to create an artificial reservoir within low‐permeability crystalline basement hydraulically stimulating rock form connected network fractures between two...
The Pohang quake shows the need for new methods to assess and manage evolving risk
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...
Earthquakes potentially serve as abundant and cost-effective gauges of tectonic stress provided that reliable means exist extracting robust parameters. Several algorithms have been developed for this task, each which typically provides information on the orientations three principal stresses a single magnitude parameter. A convenient way displaying results is to map azimuth maximum horizontal compressive stress, usually approximated using larger subhorizontal stress. This approximation...
Throughout central and southern California, a uniform NNE‐SSW direction of maximum horizontal compressive stress is observed that remarkably consistent with the superposition stresses arising from lateral variations in lithospheric buoyancy western United States, far‐field Pacific‐North America plate interaction. In axis lies at high angle to San Andreas fault (SAF). Despite relatively few observations near (±10 km) fault, greater Francisco Bay area indicate an as much 85°, implying...
Preface Part I STATISTICS BASICS Introduction A Brief Tutorial on Statistics Before You Start Designing an Experiment or Survey Exploratory Data Analysis and Presentation Common Assumptions Requirements of for Statistical Tests II STATISTICAL METHODS t--tests F--tests Variance Correlation Regression Mulitvariate ANOVA Repeated Measures Chi--square Non--parametric Principal Component Cluster Appendices Bibliography Index
The Hikurangi subduction margin, New Zealand, has not experienced any significant (> M w 7.2) interface earthquakes since historical records began ∼170 years ago. Geological data in parts of the North Island provide evidence for possible prehistoric great earthquakes. Determining seismogenic potential interface, and resulting tsunami, is critical estimating seismic hazard Zealand. Despite lack confirmed events, recent geodetic seismological results reveal that a large area...
In October 2002, a surface displacement episode of 20–30 mm magnitude was observed over ∼10 day period on two continuous Global Positioning System (GPS) instruments near Gisborne, North Island, New Zealand. We interpret this to result from slow slip the northern Hikurangi subduction interface. Using ten years regional campaign GPS (1995–2004) and recent data, we estimate recurrence interval for similar events be 2–3 yrs. November 2004, event occurred within period. The 2002 can modeled by...
The work described here has two key objectives: to investigate the geometric relationships between principal directions of crustal stress and strain rate in central Japan evaluate how stresses are related rates horizontal produced by different tectonic processes. Specifically, we consider extent which reflect transient deformation interseismic subduction thrust locking. axis maximum compressive obtained from focal mechanism inversion agrees well with greatest contractional southwest only...
Research Article| December 01, 2012 Drilling reveals fluid control on architecture and rupture of the Alpine fault, New Zealand R. Sutherland; Sutherland * 1GNS Science, PO Box 30368, Lower Hutt 5040, *E-mail: r.sutherland@gns.cri.nz. Search for other works by this author on: GSW Google Scholar V.G. Toy; Toy 2University Otago, 56, Dunedin 9054, J. Townend; Townend 3Victoria University Wellington, 600, Wellington 6140, S.C. Cox; Cox 4GNS Private Bag 1930, J.D. Eccles; Eccles 5Institute Earth...
Background Traditionally, clinical research studies rely on collecting data with case report forms, which are subsequently entered into a database to create electronic records. Although well established, this method is time-consuming and error-prone. This study compares four capture (EDC) methods the conventional approach respect duration of accuracy. It was performed in West African setting, where trials involve collection from urban, rural often remote locations. Methodology/Principal...
Research Article| December 13, 2017 EQcorrscan: Repeating and Near‐Repeating Earthquake Detection Analysis in Python Calum J. Chamberlain; Chamberlain aSchool of Geography, Environment Earth Sciences, Victoria University Wellington, New Zealand Search for other works by this author on: GSW Google Scholar Chet Hopp; Hopp Carolin M. Boese; Boese ZealandeNow at Helmholtz Centre Potsdam, GFZ German Geosciences, 14473 Germany. Emily Warren‐Smith; Warren‐Smith bGNS Science, P.O. Box 30‐368, Lower...
We investigate present‐day microseismicity associated with the central Alpine Fault and zone of active deformation uplift in Southern Alps. Using 14 months data, robust hypocenter locations have been obtained for ∼1800 earthquakes magnitudes between −0.3 4.2. derived a magnitude scale frequency‐dependent attenuation factor, γ (f) = 0 f, where 1.89 ± 0.02 × 10 −3 s/km, that enables to be calculated consistently different sizes frequency contents. The maximum depth seismicity varies...
Tectonic tremor is characterized by persistent, low‐frequency seismic energy seen at major plate boundaries. Although predominantly associated with subduction zones, also occurs along the deep extension of strike‐slip San Andreas Fault. Here we present first observations tectonic New Zealand's Alpine Fault, a transform boundary that late in its earthquake cycle. We report occurred on central section Fault 12 days between March 2009 and October 2011. Tremor hypocenters concentrate lower crust...
Abstract We present the first evidence of low‐frequency earthquakes (LFEs) associated with deep extension transpressional Alpine Fault beneath central Southern Alps New Zealand. Our database comprises a temporally continuous 36 month‐long catalog 8760 LFEs within 14 families. To generate this catalog, we identify primary template known periods seismic tremor and use these templates to detect similar events in an iterative stacking cross‐correlation routine. The hypocentres 12 LFE families...
The first phase of the Deep Fault Drilling Project (DFDP-1) yielded a continuous lithological transect through fault rock surrounding Alpine (South Island, New Zealand). This allowed micrometer- to decimeter-scale variations in lithology and structure be delineated on either side two principal slip zones intersected by DFDP-1A DFDP-1B. Here, we provide comprehensive analysis lithologies within 70 m based hand specimens detailed petrographic petrologic analysis. sequence is consistent with...
The New Zealand Community Fault Model (NZ CFM) is a publicly available representation of fault zones that have the potential to produce damaging earthquakes. Compiled through collaborative engagement between earthquake-science experts, this first edition (version 1.0) NZ CFM builds upon previous compilations earthquake-source active models with addition new and modified information. Developed primarily support an update National Seismic Hazard Model, comprises two principal components....
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.
We present a simple conceptual model in which the entire lithosphere is steady-state failure equilibrium-brittle upper crust and ductile creep lower mantle-in response to finite, buoyancy-related plate tectonic forces. demonstrate that, context of finite driving forces, high crustal strength provides first-order constraint on rate at intraplate deforms. For strike-slip stress states moderate heat flow (~60 ± 6 mW m-2), average strain rates are less than 10-17 s-1, consistent with bounds...