Göran Ekström
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View article: Earthquake Relocations Illuminate Tectonics along the Bismarck Sea Seismic Lineation, Papua New Guinea
Earthquake Relocations Illuminate Tectonics along the Bismarck Sea Seismic Lineation, Papua New Guinea Open
The Bismarck Sea Seismic Lineation (BSSL) is a 1000-km-long band of shallow earthquakes that marks the boundaries between the North and South Bismarck Plates and the Manus Microplate, offshore Papua New Guinea. These tectonic boundaries co…
View article: The propagation of seismic waves, misinformation, and disinformation from the 2024-10-05 M 4.5 Iran earthquake
The propagation of seismic waves, misinformation, and disinformation from the 2024-10-05 M 4.5 Iran earthquake Open
The 2024-10-05 Iran M 4.5 earthquake took place at a time of heightened tensions in the Middle East. We perform a discrimination and moment tensor analysis and identify a shallow-dipping, reverse fault source commensurate with the compress…
View article: Parsimonious Green function data bases for global centroid moment tensor inversions
Parsimonious Green function data bases for global centroid moment tensor inversions Open
SUMMARY The calculation of synthetic seismograms for global centroid moment tensor (GCMT) inversions relies on advanced 3-D Earth models. However, use of the path-average approximation for mode summation and surface-wave ray theory limits …
View article: Seismic and acoustic signals from the 2014 ‘interstellar meteor’
Seismic and acoustic signals from the 2014 ‘interstellar meteor’ Open
SUMMARY We conduct a thorough analysis of seismic and acoustic data purported to be from the so-called ‘interstellar meteor’ which entered the Earth’s atmosphere off the coast of Papua New Guinea on 2014 January 08. Previous work had sugge…
View article: A Preliminary Green Function Database for Global 3-D Centroid Moment Tensor Inversions
A Preliminary Green Function Database for Global 3-D Centroid Moment Tensor Inversions Open
Currently, the accuracy of synthetic seismograms used for Global CMT inversion, which are based on modern 3D Earth models, is limited by the validity of the path-average approximation for mode summation and surface-wave ray theory. Inaccur…
View article: Off-axis compression triggered by a seafloor spreading event on the Northern Mid-Atlantic Ridge, 54ºN
Off-axis compression triggered by a seafloor spreading event on the Northern Mid-Atlantic Ridge, 54ºN Open
Mid-ocean ridges are quintessential sites of extensional deformation, where large-magnitude compressional seismicity is rare and typically confined to transpressional ridge-transform intersections. Here we report on a recent, unusual seism…
View article: A Cautionary Tale: examples of the mis-location of small earthquakes beneath the Tibetan plateau by routine approaches
A Cautionary Tale: examples of the mis-location of small earthquakes beneath the Tibetan plateau by routine approaches Open
SUMMARY Earthquake moment tensors and centroid locations in the catalogue of the Global CMT (gCMT) project, formerly the Harvard CMT project, have become an essential resource for studying active global tectonics, used by many solid-Earth …
View article: A Cautionary Tale: small earthquakes that might have changed our understanding of Tibetan geodynamics --- but were mis-located
A Cautionary Tale: small earthquakes that might have changed our understanding of Tibetan geodynamics --- but were mis-located Open
Earth and Space Science Open Archive This preprint has been submitted to and is under consideration at Journal of Geophysical Research - Solid Earth. ESSOAr is a venue for early communication or feedback before peer review. Data may be pre…
View article: The 28 November 2020 Landslide, Tsunami, and Outburst Flood – A Hazard Cascade Associated With Rapid Deglaciation at Elliot Creek, British Columbia, Canada
The 28 November 2020 Landslide, Tsunami, and Outburst Flood – A Hazard Cascade Associated With Rapid Deglaciation at Elliot Creek, British Columbia, Canada Open
We describe and model the evolution of a recent landslide, tsunami, outburst flood, and sediment plume in the southern Coast Mountains, British Columbia, Canada. On November 28, 2020, about 18 million m 3 of rock descended 1,000 m from a s…
View article: Global reference seismological data sets: multimode surface wave dispersion
Global reference seismological data sets: multimode surface wave dispersion Open
SUMMARY Global variations in the propagation of fundamental-mode and overtone surface waves provide unique constraints on the low-frequency source properties and structure of the Earth’s upper mantle, transition zone and mid mantle. We con…
View article: A landslide-generated tsunami and outburst flood at Elliot Creek, coastal British Columbia  
A landslide-generated tsunami and outburst flood at Elliot Creek, coastal British Columbia   Open
<p>On 28 November 2020, about 18 Mm<sup>3</sup> of quartz diorite detached from a steep rock face at the head of Elliot Creek in the southern Coast Mountains of British Columbia. The rock mass fragmented as it descended 1…
View article: Terrestrial overview of a landslide-tsunami-flood cascade at Elliot Creek, British Columbia&#160;
Terrestrial overview of a landslide-tsunami-flood cascade at Elliot Creek, British Columbia  Open
<p>On 28 November 2020, some 18 Mm<sup>3</sup> of quartz diorite detached from a steep rock face at the head of Elliot Creek in the southern Coast Mountains of British Columbia. The rock mass fragmented as it descended 10…
View article: Emplacement dynamics of supraglacial rock avalanches: details from the 2016 Lamplugh event, Alaska
Emplacement dynamics of supraglacial rock avalanches: details from the 2016 Lamplugh event, Alaska Open
<p>In Glacier Bay Park and Preserve, Alaska, at least 25 rock avalanches occurred since the mid-1980s. The 2016 Lamplugh rock avalanche, with roughly 70 Mm<sup>3 </sup>deposit volume, is one of the larger events within th…
View article: Vertical force scaling in seismic source models of underground nuclear explosions
Vertical force scaling in seismic source models of underground nuclear explosions Open
SUMMARY We have reanalysed observations of body waves and surface waves for 71 well-recorded underground nuclear explosions (UNEs) that were conducted between 1977 and 1989 at the Balapan subregion of the Semipalatinsk Test Site in Kazakhs…
View article: Improving relative earthquake locations using surface-wave source corrections
Improving relative earthquake locations using surface-wave source corrections Open
SUMMARY We develop a procedure to improve estimates of relative earthquake locations using Rayleigh and Love wave arrivals for multiple earthquakes recorded at common stations. We fit predicted differential traveltimes to those measured us…
View article: The 2015 landslide and tsunami in Taan Fiord, Alaska
The 2015 landslide and tsunami in Taan Fiord, Alaska Open
Glacial retreat in recent decades has exposed unstable slopes and allowed deep water to extend beneath some of those slopes. Slope failure at the terminus of Tyndall Glacier on 17 October 2015 sent 180 million tons of rock into Taan Fiord,…
View article: The relationship between bulk‐mass momentum and short‐period seismic radiation in catastrophic landslides
The relationship between bulk‐mass momentum and short‐period seismic radiation in catastrophic landslides Open
The relationship between bulk‐mass dynamic properties of catastrophic landslides and the generation of short‐period seismic waves is investigated, with a particular focus on the momentum of the landslide mass and the envelope of high‐frequ…
View article: Plate coupling and strain in the far western Aleutian arc modeled from GPS data
Plate coupling and strain in the far western Aleutian arc modeled from GPS data Open
The Aleutian and Kuril‐Kamchatka arcs meet at a triple junction of the Pacific (PAC), Bering (BER), and North American (NAM) plates. We invert GPS observations from the westernmost Aleutian (Komandorsky) Islands and Kamchatka for the fault…
View article: Dataset and Software for The Relationships Between Large-scale Variations in Shear Velocity, Density, and Compressional Velocity in the Earth's Mantle
Dataset and Software for The Relationships Between Large-scale Variations in Shear Velocity, Density, and Compressional Velocity in the Earth's Mantle Open
Is there a chemically distinct reservoir in the Earth?Do superplumes overly denser-than-average material?Can we detect these anomalies with seismic data?Can we evaluate statistical significance of the features in tomography? This study pre…
View article: Dataset and Software for The Relationships Between Large-scale Variations in Shear Velocity, Density, and Compressional Velocity in the Earth's Mantle
Dataset and Software for The Relationships Between Large-scale Variations in Shear Velocity, Density, and Compressional Velocity in the Earth's Mantle Open
Is there a chemically distinct reservoir in the Earth?Do superplumes overly denser-than-average material?Can we detect these anomalies with seismic data?Can we evaluate statistical significance of the features in tomography? This study pre…