A5017030162- earthquake and tectonic studies
- Seismology and Earthquake Studies
- Seismic Waves and Analysis
- Geological and Geochemical Analysis
- Earthquake Detection and Analysis
- High-pressure geophysics and materials
- Seismic Imaging and Inversion Techniques
- Plant Diversity and Evolution
- Plant and animal studies
- Botany and Plant Ecology Studies
- Botany, Ecology, and Taxonomy Studies
- Plant Taxonomy and Phylogenetics
- Plant Reproductive Biology
- Image Processing Techniques and Applications
- Spectroscopy Techniques in Biomedical and Chemical Research
- Landslides and related hazards
- Plant and Fungal Species Descriptions
- Plant Pathogens and Fungal Diseases
- Cell Image Analysis Techniques
- Mediterranean and Iberian flora and fauna
- Geology and Paleoclimatology Research
- Fern and Epiphyte Biology
- Biocrusts and Microbial Ecology
- Diamond and Carbon-based Materials Research
- Catalysis and Oxidation Reactions
Victoria University of Wellington
2015-2024
Centre for the Observation and Modelling of Earthquakes, Volcanoes and Tectonics
2014
University of Leeds
2014
Oregon State University
2003
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...
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...
Abstract Thermal springs in the Southern Alps, New Zealand, originate through penetration of fluids into a thermal anomaly generated by rapid uplift and exhumation on Alpine Fault. Copland hot spring (43.629S, 169.946E) is one most vigorously flowing, hottest springs, discharging strongly effervescent CO 2 ‐rich 56–58°C water at 6 ± 1 l sec −1 . Shaking from Mw7.8 Dusky Sound (Fiordland) 2009 Mw7.1 Darfield (Canterbury) 2010 earthquakes, 350 180 km spring, respectively, resulted...
Abstract Taupō volcano, New Zealand, is a large caldera volcano that has been highly active through the Holocene. It most recently erupted ∼1,800 years ago but there have multiple periods of historic volcanic unrest. We use seismological and geodetic analysis to show in 2019 underwent period unrest characterized by increased seismic activity swarms was accompanied ground deformation within caldera. The earthquakes, which include non‐double‐couple events, serve outline an aseismic zone...
Abstract Fault rock assemblages reflect interaction between deformation, stress, temperature, fluid, and chemical regimes on distinct spatial temporal scales at various positions in the crust. Here we interpret measurements made hanging‐wall of Alpine during second stage Deep Drilling Project (DFDP‐2). We present observational evidence for extensive fracturing high hydraulic conductivity (∼10 −9 to 10 −7 m/s, corresponding permeability ∼10 −16 −14 m 2 ) extending several hundred meters from...
Abstract The Alpine Fault is an oblique strike‐slip fault that known to fail in large magnitude (M7–8) earthquakes, yet it currently seismically quiescent. We examine the low‐magnitude earthquake activity occurring along central portion of using seismic data from five temporary networks deployed for various lengths time between late 2008 and early 2017. Starting continuous data, we detect arrivals construct longest most extensive microearthquake catalog region date, containing 9,111...
Abstract The 14 November 2016 M w 7.8 Kaikōura earthquake in the northern South Island, New Zealand, involved highly complex, multifault rupture. We combine data from a temporary network and permanent national seismograph to repick relocate ~2,700 aftershocks of M≥3 that occurred between 13 May 2017. Automatic phase‐picking is carried out using REST, newly developed hybrid method whose pick quality assessed by comparing automatic picks for subset 138 events with analysts' picks. Aftershock...
1. (a) The early development of the macrospore Aster Novoe-Anglioe differs little from described types. (b) formation secondary nucleus has no relation to a sexual process. 2. egg is sometimes spherical and pear-shaped. vacuoles nuclei synergidae vary in position.(c) There striking uniformity size nucleoli egg-apparatus endosperm-nucleus. 3. number antipodal cells varies two thirteen. Six or seven are as frequent numbers three.(b) an cell one over twenty. (c) lower rest size, density its...
In southwestern Zealandia, the plate boundary transitions from Puysegur oblique subduction zone to 600-km long transpressive Alpine Fault and Southern Alps uplift zone.  Utilizing abundant earthquake observations, we construct a 3D seismic velocity model 130-km depth that demonstrates strong lithosphere of Fiordland block defines character deformation along Highly convergence combined with relatively-weak young slab enables sharp bending as it is translated northward around...
During the second phase of Alpine Fault, Deep Fault Drilling Project (DFDP) in Whataroa River, South Westland, New Zealand, bedrock was encountered DFDP-2B borehole from 238.5–893.2 m Measured Depth (MD). Continuous sampling and meso- to microscale characterisation whole rock cuttings established that, sequence, sampled amphibolite facies, Torlesse Composite Terrane-derived schists, protomylonites mylonites, terminating 200–400 above an Principal Slip Zone (PSZ) with a maximum dip 62°. The...
Abstract The 2016 M7.8 Kaikōura earthquake is one of the most complex earthquakes in recorded history, with significant rupture at least 21 crustal faults. Using a matched‐filter detection routine, precise cross‐correlation pick corrections, and accurate location relocation techniques, we construct catalog 33,328 between 2009 2020 on adjacent to faults that ruptured earthquake. We also compute focal mechanisms for 1,755 used as templates. this reassess pathway In particular show that: (a)...
Abstract Relative relocation techniques are widely used to improve the resolution of earthquake hypocenter positions. Here, we present GrowClust3D.jl—an open-source software package written in programming language Julia that builds and improves upon original GrowClust algorithm, an established relative technique based on cluster analysis instead a more traditional matrix inversion approach. The adoption Julia’s modern environment allows for greater flexibility GrowClust3D.jl’s algorithm...
Research Article| June 07, 2017 High‐Precision Analysis of an Aftershock Sequence Using Matched‐Filter Detection: The 4 May 2015 ML 6 Wanaka Earthquake, Southern Alps, New Zealand Emily Warren‐Smith; Warren‐Smith aInstitute Geophysics, School Geography, Environment and Earth Sciences, Victoria University Wellington, P.O. Box 600, Wellington 6140, Zealand, e.warren-smith@gns.cri.nz, calum.chamberlain@vuw.ac.nz, simon.lamb@vuw.ac.nz, john.townend@vuw.ac.nzbNow at GNS Science, BOX 30‐368, Lower...
Abstract Paleoseismic evidence from the late‐interseismic Alpine Fault suggests key section boundaries conditionally inhibit rupture. We utilize a year of data two‐part seismometer network (Dense Westland Arrays Researching Segmentation) to characterize ∼7,500 earthquakes (−0.7 ≤ M Lv 4.2) and ∼800 focal mechanisms, producing high‐resolution structural images these study effects material heterogeneities on mode‐switching rupture behavior. Lithologically‐controlled frictional behavior crustal...
Abstract. The city of Auckland, New Zealand (Tāmaki Makaurau, Aotearoa), sits on top an active volcanic field. Seismic stations in and around the monitor activity Auckland Volcanic Field (AVF) provide data to image its subsurface. seismic sensors – some positioned at surface others boreholes are generally noisier during day than nighttime. For most stations, weekdays weekends, proving human contributes recordings noise, even seismographs as deep 384 m below far 15 km from Auckland's Central...
Abstract This study evaluates EQTransformer, a deep learning model, for earthquake detection and phase picking using seismic data from the Southern Alps, New Zealand. Using robust, independent dataset containing more than 85,000 manual picks 13 stations spanning almost nine years, we assess EQTransformer’s performance limitations in practical application scenario. We investigate key parameters such as overlap probability threshold their influences on consistency false positives,...
Abstract We report the first catalog of low‐frequency earthquakes in Hikurangi subduction zone, located beneath Kaimanawa Range North Island at 50 km depth, downdip regularly recurring (every 4–5 years) deep M7 slow slip events. To systematically detect within regional continuous seismic data, we utilized a matched‐filter approach with template waveforms derived from previous observations tectonic tremor. built our 36 earthquake sources, that produced almost 21,000 events over more than...
Tens of thousands earthquakes are located by GeoNet across Aotearoa every year. However, spatial variability – both in station coverage and earthquake distributions produce heterogeneity location quality throughout the catalogue. Here we consider simple, established criteria (including azimuthal coverage, minimum distance, phase arrival fixed criteria) to score on a network Quality Score (QS) scale QS0 (unconstrained) QS6 (best constrained). Significant variation QS exists nationwide; 48%...
The Deep Fault Drilling Project (DFDP) on the central Alpine Fault, South Island, New Zealand, has motivated a broad range of geophysical and geological studies intended to characterize fault system in locality drill site at various scales. In order better understand structural features we have developed 3-D P- S-wave velocity (VP VS) models region by double-difference tomography using data sets from multiple seismic networks. previous work, quality model been poor due small number available...