Preprints
Filtering by Subject: Geophysics and Seismology
Transforming Total Field Anomaly into Anomalous Magnetic Field: Using Dual-Layer Gradient-Boosted Equivalent Sources
Published: 2025-04-25
Subjects: Earth Sciences, Geophysics and Seismology, Physical Sciences and Mathematics
Potential field data often require interpolation onto a regular grid at constant height before further analysis. A widely used approach for this is the equivalent sources technique, which has been adapted over time to improve its computational efficiency and accuracy of the predictions. However, many of these approaches still face challenges, including border effects in the predictions or [...]
Automatic differentiation and geodynamic inversion
Published: 2025-04-23
Subjects: Geophysics and Seismology, Physical Sciences and Mathematics
The rheological properties of the mantle govern plate tectonics and mantle convection, yet constraining the rheological parameters remains a significant challenge. Laboratory experiments are usually performed under different temperature-pressure-strain-rate conditions than those of natural environments, leading to substantial uncertainties when extrapolating the parameters to real-world [...]
Optimizing data usage in regional body wave tomography by using asynchronous network data and relative sensitivity kernels: an example from Patagonia
Published: 2025-04-20
Subjects: Earth Sciences, Geophysics and Seismology, Physical Sciences and Mathematics
A very frequent approach for studying lithospheric processes is to deploy temporary seismological networks in dedicated areas and to map the mantle structures with different approaches. One of them is the well-established relative travel time body wave tomography. Different circumstances often lead to a non uniform deployment of stations both in space and time, and a wish to combine data which [...]
A multiple asymmetric bilateral rupture sequence derived from the peculiar tele-seismic P-waves of the 2025 Myanmar earthquake
Published: 2025-04-10
Subjects: Geophysics and Seismology
A large strike-slip earthquake occurred in central Myanmar on March 28, 2025. The aftershock distribution suggests that the rupture of the mainshock propagated mainly to the south. However, a large-amplitude phase lasting 20 s, followed by a short-period pulse-like phase, were observed at the stations on the north side of the source, while on the south side tremor-like phases with multiple peaks [...]
Deep source regions for Patagonia backarc volcanism imaged by finite frequency body wave tomography
Published: 2025-04-08
Subjects: Earth Sciences, Geochemistry, Geology, Geophysics and Seismology, Glaciology, Physical Sciences and Mathematics, Tectonics and Structure, Volcanology
The subduction of Chile Ridge beneath South America beginning 12-16 Myr ago opened a gap in the subducting slab beneath southern Patagonia, which migrated northward and is located today at 46oS. Geodynamic processes associated with the slab window are poorly understood. Here we apply finite-frequency P and S body wave tomography to seismic data from several temporary arrays as well as regional [...]
A New Fault Model for the 1933 Long Beach Earthquake, Long Beach Area, Southern California
Published: 2025-04-05
Subjects: Earth Sciences, Geology, Geophysics and Seismology, Physical Sciences and Mathematics
Newly identified thrust faults and their corresponding thrust sheets, combined with recent micro-earthquake epicenters, better explain anomalous rupture data observed during the 1933 Long Beach Earthquake than previous models based exclusively on Newport-Inglewood Fault Zone strike-slip faulting. A high-quality 45 km2 3D seismic dataset was recorded in 2017, centered along the Seal Beach [...]
Robust directional analysis of magnetic microscopy images using non-linear inversion and iterative Euler deconvolution
Published: 2025-03-29
Subjects: Geophysics and Seismology
The first step in scientific data acquisition often involves analyzing entire samples, providing only a general characterization of the material. Enhancing data acquisition by improving spatial resolution and isolating the underlying phenomena contributing to the overall signal has become a central direction in various scientific fields. In paleomagnetism, this advancement is now possible with [...]
The complex rupture evolution of the long and slow, tsunamigenic 2021 South Sandwich Islands earthquake
Published: 2025-03-27
Subjects: Geophysics and Seismology
On August 21, 2021 a large earthquake occurred in the South Sandwich subduction zone, and the associated tsunami was widely observed. In order to robustly analyse the detailed seismic source process of this long-source duration (over 200 s) event occurring in a convexly shaped subduction zone, we applied the Potency Density Tensor Inversion with a non-rectangular and non-planar source surface to [...]
Fully-dynamic seismic cycle simulations in co-evolving fault damage zones controlled by damage rheology
Published: 2025-03-26
Subjects: Geophysics and Seismology
Both short-term coseismic off-fault damage and long-term fault growth during interseismic periods have been suggested to contribute to the formation and evolution of fault damage zones. Most previous numerical models focus on simulating either off-fault damage in a single earthquake or off-fault plasticity in seismic cycles ignoring changes of elastic moduli. Here we developed a new method to [...]
First-order Control Factors for Ocean-bottom Ambient Seismology Interferometric Observations
Published: 2025-03-23
Subjects: Geophysics and Seismology
Expanding the lower-frequency band of seismic energy sources, particularly below 2.0~Hz, is crucial for improving the stability and effectiveness of full waveform inversion (FWI). Conventional active sources including airguns are ineffective at generating low-frequency wavefields, while ambient seismic wavefields, driven by natural energy sources such as ocean waves, offer a promising [...]
Ocean-bottom Seismic Interferometry in Coupled Acoustic-Elastic Media
Published: 2025-03-23
Subjects: Geophysics and Seismology
Green’s function expressions for seismic interferometry in acoustic and elastic media have been extensively studied and applied across a wide range of applications, including surface-wave tomography and generating virtual shot gathers. However, analogous expressions for coupled acoustic-elastic media systems remain absent, despite their importance for analysing cross-correlation wavefields from [...]
Low computational cost stochastic Gassmann fluid substitution modelling of hydrogen and carbon dioxide in clastic storage reservoirs
Published: 2025-03-06
Subjects: Geology, Geophysics and Seismology
The ability to safely store non-hydrocarbon fluids in the subsurface, such as carbon dioxide or hydrogen, will likely be vital in all pathways to decarbonise global energy systems. Storage of these fluids will require monitoring programmes to identify dynamic changes during the injection and storage phases and to identify unintended migration. Seismic monitoring is widely adopted in monitoring [...]
Magnetotelluric source amplitude effect
Published: 2025-03-04
Subjects: Earth Sciences, Geophysics and Seismology
Challenges and Opportunities in Cryosphere in the Hindu Kush Himalaya
Published: 2025-03-04
Subjects: Earth Sciences, Geophysics and Seismology, Glaciology, Physical Sciences and Mathematics
The Hindu Kush Himalaya cryosphere faces critical challenges from climate change, including rapid glacier melt and reduced snow cover. These changes threaten water resources, ecosystems, and livelihoods across the region. However, opportunities emerge through advanced monitoring technologies and increased scientific understanding. Improved remote sensing and field observations allow better [...]
Seismic imaging of mid-crustal heterogeneity beneath geothermal systems, central Taupo Volcanic Zone, New Zealand
Published: 2025-02-26
Subjects: Earth Sciences, Geophysics and Seismology
The Taupo Volcanic Zone (TVZ) in New Zealand is a region of highly pro- ductive Quaternary volcanism and very large hydrothermal heat flux. Here we investigate the upper- and mid-crustal seismic velocity structure of a region within the central, rhyolitic part of the TVZ encompassing the high- temperature geothermal systems Mokai, Wairakei, Ng¯a Tamariki, Orakei Korako, Te Kopia and Rotokawa. [...]