Tim Greenfield
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View article: Migrated Teleseismic P Wave Receiver Functions Reveal Intricate Post‐Subduction Crust and Upper Mantle Structure of Northern Borneo (Sabah), Malaysia
Migrated Teleseismic P Wave Receiver Functions Reveal Intricate Post‐Subduction Crust and Upper Mantle Structure of Northern Borneo (Sabah), Malaysia Open
Borneo is a key piece of the regional tectonic puzzle of southeast Asia and a unique location to study subduction termination, particularly in the north. The tectonic history of Sabah in northern Borneo includes elements of five different …
View article: Pre‐Existing Structures Control the Orientation of Strike‐Slip Faulting During the 2021 Dike Intrusion at Fagradalsfjall, Iceland
Pre‐Existing Structures Control the Orientation of Strike‐Slip Faulting During the 2021 Dike Intrusion at Fagradalsfjall, Iceland Open
The 2021 Fagradalsfjall inflation and dike intrusion marked the initiation of a new era of volcanism on Iceland's Reykjanes Peninsula. We present a large automatic catalog consisting of more than 80,000 earthquake hypocenters spanning the …
View article: Seismic Imaging of the Reykjanes Peninsula, Iceland: Crustal‐Scale Context of Geothermal Areas and Ongoing Volcano‐Tectonic Unrest
Seismic Imaging of the Reykjanes Peninsula, Iceland: Crustal‐Scale Context of Geothermal Areas and Ongoing Volcano‐Tectonic Unrest Open
Volcanic and seismic unrest on the Reykjanes Peninsula in SW Iceland that started in late 2019 after ∼800 years of quiescence has drawn wide interest to this on‐land extension of the Mid‐Atlantic spreading ridge. Here, we use seismic data …
View article: Pre-existing structures control the orientation of strike-slip faulting during the 2021 Fagradalsfjall dike intrusion
Pre-existing structures control the orientation of strike-slip faulting during the 2021 Fagradalsfjall dike intrusion Open
The 2021 Fagradalsfjall dike intrusion marked the initiation of a new era of volcanism on Iceland’s Reykjanes Peninsula. In this study, we present a large automatic catalog consisting of more than 80,000 earthquake hypocenters spanni…
View article: Evidence of a Shallow Magma Reservoir Beneath Askja Caldera, Iceland, From Body Wave Tomography
Evidence of a Shallow Magma Reservoir Beneath Askja Caldera, Iceland, From Body Wave Tomography Open
In August 2021, Askja caldera switched to reinflation following ∼40 years of continuous deflation that was first measured some 20 years after its last eruption in 1961. Various lines of evidence, including from geodetic modeling, suggest t…
View article: Crustal structure of Borneo, Makassar Strait and Sulawesi from ambient noise tomography
Crustal structure of Borneo, Makassar Strait and Sulawesi from ambient noise tomography Open
SUMMARY Borneo and Sulawesi are two large islands separated by the Makassar Strait that lie within the complex tectonic setting of central Indonesia. The seismic structure beneath this region is poorly understood due to the limited data av…
View article: 3-D Shear Wave Velocity (Vs) & Crustal Interface (Sediment Basement & Moho) Models of Borneo, Makassar Strait, & Sulawesi Region
3-D Shear Wave Velocity (Vs) & Crustal Interface (Sediment Basement & Moho) Models of Borneo, Makassar Strait, & Sulawesi Region Open
An update version of 3-D Shear Wave Velocity (Vs) & Crustal Interface (Sediment Basement & Moho) Models of Borneo, Makassar Strait and Sulawesi region obtained from group velocity tomography. Group velocity is retrieved from dispersion ana…
View article: Evidence of subduction, collision, and extension in northern Borneo: Constraints from receiver function
Evidence of subduction, collision, and extension in northern Borneo: Constraints from receiver function Open
Northern Borneo (Sabah) has a complex geological history, experiencing multiple episodes of subduction, magmatism, uplift, subsidence, and extension since the Mesozoic. This includes the subduction of the proto-South China Sea beneath Saba…
View article: Temporal clustering of fissural eruption across multiple segments within the Ethiopian Rift
Temporal clustering of fissural eruption across multiple segments within the Ethiopian Rift Open
Magmatic continental rifts show evidence that discrete rift segments experience episodic intrusive and eruptive events, more commonly termed rifting episodes. However, whether multiple rifting episodes across adjacent rift segments are clu…
View article: 3-D Shear Wave Velocity (Vs) & Crustal Interface (Sediment Basement & Moho) Models of Borneo, Makassar Strait, & Sulawesi Region
3-D Shear Wave Velocity (Vs) & Crustal Interface (Sediment Basement & Moho) Models of Borneo, Makassar Strait, & Sulawesi Region Open
3-D Shear Wave Velocity (Vs) & Crustal Interface (Sediment Basement & Moho) Models of Borneo, Makassar Strait and Sulawesi region obtained from group velocity tomography. Group velocity is retrieved from dispersion analysis of Rayleigh wav…
View article: 3-D Shear Wave Velocity (Vs) & Crustal Interface (Sediment Basement & Moho) Models of Borneo, Makassar Strait, & Sulawesi Region
3-D Shear Wave Velocity (Vs) & Crustal Interface (Sediment Basement & Moho) Models of Borneo, Makassar Strait, & Sulawesi Region Open
An update version of 3-D Shear Wave Velocity (Vs) & Crustal Interface (Sediment Basement & Moho) Models of Borneo, Makassar Strait and Sulawesi region obtained from group velocity tomography. Group velocity is retrieved from dispersion ana…
View article: Relatively relocated seismicity during the 2021 Fagradalsfjall dyke intrusion, Reykjanes Peninsula, Iceland: Detailed evolution of a lateral dyke, and comparison to Bárðarbunga-Holuhraun
Relatively relocated seismicity during the 2021 Fagradalsfjall dyke intrusion, Reykjanes Peninsula, Iceland: Detailed evolution of a lateral dyke, and comparison to Bárðarbunga-Holuhraun Open
The 2021 Fagradalsfjall eruption on Iceland’s Reykjanes Peninsula was preceded by more than 12 months of elevated seismic and inflationary activity, beginning around December 2019. On 24th February 2021, an exceptionally intense epis…
View article: Crustal context of the Fagradalsfjall eruption: shear-wave velocity structure of the Reykjanes Peninsular from receiver function analysis
Crustal context of the Fagradalsfjall eruption: shear-wave velocity structure of the Reykjanes Peninsular from receiver function analysis Open
Detailed investigation into local seismicity and geochemical analysis of erupted products from the 2021-22 Fagradalsfjall eruption has already provided new insights into the deep magma plumbing system beneath the Reykjanes Peninsular. Here…
View article: Imaging the Magmatic Plumbing System beneath Askja Caldera, Iceland with Seismic Tomography
Imaging the Magmatic Plumbing System beneath Askja Caldera, Iceland with Seismic Tomography Open
Askja caldera is a large central volcano located in the Northern Volcanic Zone in Iceland. It has experienced a number of eruptions in modern history with one of the largest taking place in 1875, from which tephra managed to travel as far …
View article: <i>SASSIER22</i>: Full‐Waveform Tomography of the Eastern Indonesian Region That Includes Topography, Bathymetry, and the Fluid Ocean
<i>SASSIER22</i>: Full‐Waveform Tomography of the Eastern Indonesian Region That Includes Topography, Bathymetry, and the Fluid Ocean Open
We present a new 3‐D seismic structural model of the eastern Indonesian region and its surroundings from full‐waveform inversion (FWI) that exploits seismic data filtered at periods between 15–150 s. SASSY21 —a recent 3‐D FWI tomographic m…
View article: Supplementary material "SASSIER22: Full-waveform tomography of the eastern Indonesian region that includes topography, bathymetry and the fluid ocean
Supplementary material "SASSIER22: Full-waveform tomography of the eastern Indonesian region that includes topography, bathymetry and the fluid ocean Open
Supplementary material “SASSIER22: Full-waveform tomography of the eastern Indonesian region that includes surface topography and the fluid ocean” by Wehner, D., Rawlinson, N., Greenfield, T., Daryono, Miller, M.S., Supendi, P., Lü, ChuanC…
View article: Supplementary material "SASSIER22: Full-waveform tomography of the eastern Indonesian region that includes topography, bathymetry and the fluid ocean
Supplementary material "SASSIER22: Full-waveform tomography of the eastern Indonesian region that includes topography, bathymetry and the fluid ocean Open
Supplementary material “SASSIER22: Full-waveform tomography of the eastern Indonesian region that includes surface topography and the fluid ocean” by Wehner, D., Rawlinson, N., Greenfield, T., Daryono, Miller, M.S., Supendi, P., Lü, ChuanC…
View article: SASSIER22: Full-waveform tomography of the eastern Indonesian region that includes surface topography and the fluid ocean
SASSIER22: Full-waveform tomography of the eastern Indonesian region that includes surface topography and the fluid ocean Open
We present a new 3-D seismic structural model of the eastern Indonesian region and its surroundings from full-waveform inversion (FWI) that exploits seismic data filtered at periods between 15 - 150 s. SASSY21 - a recent 3-D FWI tomographi…
View article: Imaging the anisotropic structure of the Reykjanes Peninsula across the 2021 Fagradalsfjall dyke intrusion through local shear-wave splitting analysis
Imaging the anisotropic structure of the Reykjanes Peninsula across the 2021 Fagradalsfjall dyke intrusion through local shear-wave splitting analysis Open
<p>Since late 2019, the Reykjanes Peninsula in Iceland has experienced elevated seismic activity, which culminated in a dyke intrusion beneath Fagradalsfjall on 24<sup>th</sup> February 2021, and an eruption on 19<sup&…
View article: Variation of crustal thickness in Borneo and Sulawesi
Variation of crustal thickness in Borneo and Sulawesi Open
<p>The Southeast Asia (SEA) region is tectonically very active as it accommodates the northward movement of the Indo-Australian plate in the south and the westward movement of the Philippine Sea plate in the east. Borneo and Sulawesi…
View article: Relatively-relocated seismicity during the 2021 Fagradalsfjall dyke intrusion, Reykjanes Peninsula, Iceland: Detailed evolution of a lateral dyke, and comparison to B&#225;r&#240;arbunga-Holuhraun
Relatively-relocated seismicity during the 2021 Fagradalsfjall dyke intrusion, Reykjanes Peninsula, Iceland: Detailed evolution of a lateral dyke, and comparison to Bárðarbunga-Holuhraun Open
<p>The 2021 Fagradalsfjall eruption on Iceland&#8217;s Reykjanes Peninsula was preceded by more than 12 months of elevated activity, beginning around November 2019. This dominantly consisted of episodes of intense seismic swarms,…
View article: Deep seismicity preceding and during the 2021 Fagradalsfjall eruption, Reykjanes Peninsula, Iceland&#160;
Deep seismicity preceding and during the 2021 Fagradalsfjall eruption, Reykjanes Peninsula, Iceland  Open
<div> <p><span>Using a dense network of seismometers located on the Reykjanes Peninsula of Iceland we image a cluster of earthquakes located </span><span>at a depth of 10-15 km, </span><span>beneat…
View article: Effects of subduction termination processes on continental lithosphere
Effects of subduction termination processes on continental lithosphere Open
<p>Subduction is the main driver of tectonic activity on Earth. Termination of subduction is followed by diverse and unexpected tectonic activity, such as anomalous magmatism, exhumation, subsidence and subsequent rapid uplift. What …
View article: Datasets attached to "Deep long period seismicity preceding and during the 2021 Fagradalsfjall eruption, Iceland"
Datasets attached to "Deep long period seismicity preceding and during the 2021 Fagradalsfjall eruption, Iceland" Open
Additional datasets for "Deep long period seismicity preceding and during the 2021 Fagradalsfjall eruption, Iceland " submitted to Bulletin of Volcanology. Please see the README for further details
View article: Post‐Subduction Tectonics of Sabah, Northern Borneo, Inferred From Surface Wave Tomography
Post‐Subduction Tectonics of Sabah, Northern Borneo, Inferred From Surface Wave Tomography Open
We use two‐plane‐wave tomography with a dense network of seismic stations across Sabah, northern Borneo, to image the shear wave velocity structure of the crust and upper mantle. Our model is used to estimate crustal thickness and the dept…
View article: Shear wave model of Sabah, North Borneo, from surface wave tomography
Shear wave model of Sabah, North Borneo, from surface wave tomography Open
Supplementary Information from "Post-subduction tectonics of Sabah, North Borneo, inferred from surface wave tomography" by Tim Greenfield, Amy Gilligan, Simone Pilia, David G. Cornwall, Felix Tongkul, Sri Widiyantoro & Nick Rawlinson
View article: Shear wave model of Sabah, North Borneo, from surface wave tomography
Shear wave model of Sabah, North Borneo, from surface wave tomography Open
Supplementary Information from "Post-subduction tectonics of Sabah, North Borneo, inferred from surface wave tomography" by Tim Greenfield, Amy Gilligan, Simone Pilia, David G. Cornwall, Felix Tongkul, Sri Widiyantoro & Nick Rawlinson