J. Kummerow
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View article: A repeating earthquake catalog for Northern Chile
A repeating earthquake catalog for Northern Chile Open
Repeating earthquakes are nearly identical seismic events that are assumed to occur reiteratively on the same fault-patch with highly consistent focal mechanisms. Their magnitude-dependent recurrence intervals can be used to estimate local…
View article: Microseismic activity in the Eastern Alps: Sequences, mechanisms, and active faults
Microseismic activity in the Eastern Alps: Sequences, mechanisms, and active faults Open
The southern and eastern Alps are a fascinating target region for a seismological study because they include the deformation front of Adria-Europe convergence with historically significant events (e.g., M 6.0 Friuli 1976) as well as areas …
View article: Anti-repeating earthquakes in North Chile: a very rare observation
Anti-repeating earthquakes in North Chile: a very rare observation Open
Repeating earthquakes are an expression of repeated activation of the same fault patch (asperity), with full or significant rupture area overlap. They can be used to locally characterize slip behavior, dynamics, and fine structure of fault…
View article: Microseismicity in the Large‐N Swath‐D Network: Revealing Seismic Sequences and Active Faults in the Eastern Alps
Microseismicity in the Large‐N Swath‐D Network: Revealing Seismic Sequences and Active Faults in the Eastern Alps Open
Uniformly spaced large‐N seismic networks like the Swath‐D (2017–2019), a densified part of the AlpArray initiative, provide unmatched opportunities to study microseismic activity and fault structures. Here, we show how the combined analys…
View article: Seismicity clusters in the Eastern Alps: New insights from the large-N Swath-D seismic network
Seismicity clusters in the Eastern Alps: New insights from the large-N Swath-D seismic network Open
The installation of the temporary, large-N Swath-D seismic network in the years 2017-2019 (Heit et al., 2021) provided the basis for the recent compilation of a high-resolution, consistently processed seismicity catalogue for the eastern a…
View article: A Comprehensive Stress Drop Map From Trench to Depth in the Northern Chilean Subduction Zone
A Comprehensive Stress Drop Map From Trench to Depth in the Northern Chilean Subduction Zone Open
We compute stress drops for earthquakes in Northern Chile recorded between 2007 and 2021. By applying two analysis techniques, (a) the spectral ratio (SR) method and (b) the spectral decomposition (SDC) method, a stress drop map for the su…
View article: A new seismicity catalogue of the eastern Alps using the temporary Swath-D network
A new seismicity catalogue of the eastern Alps using the temporary Swath-D network Open
We present a new, consistently processed seismicity catalogue for the eastern and southern Alps based on the temporary dense Swath-D monitoring network. The final catalogue contains 6053 earthquakes for the time period 2017–2019 and has a …
View article: A New Seismicity Catalogue of the Eastern Alps Using the Temporary Swath-D Network
A New Seismicity Catalogue of the Eastern Alps Using the Temporary Swath-D Network Open
We present a new, consistently processed seismicity catalogue for the Eastern and Southern Alps, based on the temporary dense Swath-D monitoring network. The final catalogue includes 6, 053 earthquakes for the time period 2017–2019 and has…
View article: Spatial and Temporal Patterns in Eastern-Alpine Seismicity
Spatial and Temporal Patterns in Eastern-Alpine Seismicity Open
We exploit a new template matching based catalogue to study the spatialand temporal patterns of seismicity in the Eastern and Southern Alps. Datafrom the AlpArray Swath-D network from late 2017 to late 2019 were used toenhance the resoluti…
View article: Experimental constraints on the controlling mechanisms of tectonic tremors
Experimental constraints on the controlling mechanisms of tectonic tremors Open
Tectonic (or non-volcanic) tremors have been extensively documented at subduction zones and are considered as the signature of transport processes of dehydration-related fluids in subduction zones, often recorded in close association with …
View article: Stress Drop Segmentation in the Northern Chilean Subduction Zone: from Interface to Deep Seismicity.
Stress Drop Segmentation in the Northern Chilean Subduction Zone: from Interface to Deep Seismicity. Open
We produced a comprehensive stress drop catalog for northern Chile. To improve reliability, we applied a combination of two different stress drop estimation approaches. The result is a mapped stress drop distribution for more than 30,000 e…
View article: On Repeating Earthquakes in the Northern Chilean Subduction Zone
On Repeating Earthquakes in the Northern Chilean Subduction Zone Open
<p>At the northern Chilean subduction zone, where the IPOC network has been monitoring seismicity since 2007, we have identified multiple families of repeating earthquakes. High data quality and long observation time allow analyzing …
View article: Regional centroid moment tensor inversion of small to moderate earthquakes in the Alps using the dense AlpArray seismic network: challenges and seismotectonic insights
Regional centroid moment tensor inversion of small to moderate earthquakes in the Alps using the dense AlpArray seismic network: challenges and seismotectonic insights Open
The Alpine mountains in central Europe are characterized by a heterogeneous crust accumulating different tectonic units and blocks in close proximity to sedimentary foreland basins. Centroid moment tensor inversion provides insight into th…
View article: Stress Drop Variations in the Region of the 2014 <i>M</i><sub><i>W</i></sub>8.1 Iquique Earthquake, Northern Chile
Stress Drop Variations in the Region of the 2014 <i>M</i><sub><i>W</i></sub>8.1 Iquique Earthquake, Northern Chile Open
We compute stress drops from P and S phase spectra for 534 earthquakes in the source region of the 2014 M W 8.1 Iquique megathrust earthquake in the northern Chilean subduction zone. An empirical Green's function based method is applied to…
View article: Stress Drops from Trench to Depth in the Northern Chilean Subduction Zone
Stress Drops from Trench to Depth in the Northern Chilean Subduction Zone Open
<div> <div> <div> <p>At the northern Chilean subduction zone the IPOC network monitors seismicity since 2007. During the observation time period two very large earthquakes occurred, the 2007 MW 7.7 Tocopilla earthqu…
View article: Implications on recent tectonics in the Alps from centroid moment tensor inversion of weak to moderate seismicity
Implications on recent tectonics in the Alps from centroid moment tensor inversion of weak to moderate seismicity Open
<p><span>Despite recent tectonic activity, the Alpine mountain range in central Europe is </span><span>mostly </span><span>characterized by weak to moderate seismicity. </span><span>L</spa…
View article: Regional centroid MT inversion of small to moderate earthquakes inthe Alps using the dense AlpArray seismic network: challenges andseismotectonic insights
Regional centroid MT inversion of small to moderate earthquakes inthe Alps using the dense AlpArray seismic network: challenges andseismotectonic insights Open
The Alpine mountains in central Europe are characterized by a heterogeneous crust accumulating different tectonic units and blocks in close proximity to sedimentary foreland basins. Centroid moment tensor inversion provides insight into th…
View article: Statistics of the Seismic Sequence and Rupture Directivity of the M5.5 Earthquake in Orkney, South Africa
Statistics of the Seismic Sequence and Rupture Directivity of the M5.5 Earthquake in Orkney, South Africa Open
Despite our general knowledge of earthquake processes, it is still not fully understood how earthquake ruptures nucleate and propagate and why they stop. Also, the controlling factors of the frequency and of the size of earthquakes are sub…
View article: Forming a Mogi Doughnut in the years prior to and immediately before the the 2014 M8.1 Iquique, Northern Chile Earthquake
Forming a Mogi Doughnut in the years prior to and immediately before the the 2014 M8.1 Iquique, Northern Chile Earthquake Open
Asperities are patches where the fault surfaces stick until they break in earthquakes. Locating asperities and understanding their causes in subduction zones is challenging because they are generally located offshore. We use seismicity, in…
View article: Probing the Northern Chile Megathrust With Seismicity: The 2014 M8.1 Iquique Earthquake Sequence
Probing the Northern Chile Megathrust With Seismicity: The 2014 M8.1 Iquique Earthquake Sequence Open
We used data from >100 permanent and temporary seismic stations to investigate seismicity patterns related to the 1 April 2014 M8.1 Iquique earthquake in northern Chile. Applying a multistage automatic event location procedure to the seism…
View article: Local mean age of melt: New approaches for die optimisation
Local mean age of melt: New approaches for die optimisation Open
In the design process of extrusion dies, the utilisation of computational fluid dynamics (CFD) is state of the art. To evaluate the distribution quality of different die geometries, the circumferential velocity at die exit is the most comm…
View article: Patterns of Rupture Directivity of Subduction Zone Earthquakes in Northern Chile
Patterns of Rupture Directivity of Subduction Zone Earthquakes in Northern Chile Open
We perform a systematic directivity analysis of local seismic events west off the coast of northern Chile. An empirical Green's function technique is applied to a selection of events from a time period from 2008 to 2016 in the vicinity of …
View article: Watching Dehydration: Seismic Indication for Transient Fluid Pathways in the Oceanic Mantle of the Subducting Nazca Slab
Watching Dehydration: Seismic Indication for Transient Fluid Pathways in the Oceanic Mantle of the Subducting Nazca Slab Open
Intermediate depth seismicity in subduction zones often occurs in the form of two slab‐parallel bands. We estimated the seismic P to S wave velocity ratio within the shallowest part of the lower seismicity zone (LSZ) in the mantle of the s…
View article: From Slab Coupling to Slab Pull: Stress Segmentation in the Subducting Nazca Plate
From Slab Coupling to Slab Pull: Stress Segmentation in the Subducting Nazca Plate Open
We investigate the stress field that the Nazca slab experiences during subduction beneath the South American plate by determining the focal mechanisms of moderate subduction‐related earthquakes continuously from 20‐ to 120‐km depth and inv…
View article: Buoyancy, collision, and densification of the subducting Nazca slab inferred from focal mechanisms of small earthquakes
Buoyancy, collision, and densification of the subducting Nazca slab inferred from focal mechanisms of small earthquakes Open
In the Central Andean subduction system the oceanic Nazca plate subducts beneath the continental SouthAmerican Plate. We recorded slab-related earthquakes at depths between 20 km and 120 km, both in the oceaniccrust and mantle. We determin…
View article: State of stress and crustal fluid migration related to west-dipping structures in the slab-forearc system in the northern Chilean subduction zone
State of stress and crustal fluid migration related to west-dipping structures in the slab-forearc system in the northern Chilean subduction zone Open
Previous studies in the forearc of the northern Chilean subduction zone have identified important tectonic features in the upper crust. As a result of these works, the West Fissure Fault System (WFFS) has recently been imaged using microse…