Earth,Planets and Space

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Stress loading and the occurrence of normal-type earthquakes under Boso Peninsula, Japan

Wed, 06/03/2020 - 00:00
Boso Peninsula, Japan, was formed by the interaction of the Philippine Sea, Eurasian and Pacific plates around the trench–trench–trench Boso triple junction. Normal-type earthquakes are persistently observed i...

Toward comparable relative locations between the mainshock slip and aftershocks via empirical approaches

Wed, 06/03/2020 - 00:00
The relative locations between mainshocks and their aftershocks have long been studied to characterize the mainshock–aftershock relationships, yet these comparisons may be subjected to biases inherited from va...

Altitude effects of localized source currents on magnetotelluric responses

Mon, 06/01/2020 - 00:00
The effects of localized source currents on Earth’s magnetotelluric (MT) responses have been reported in the literature in terms of the changes in period and subsurface structure. The focus in this study is on...

Comparison of two time-marching schemes for dynamic rupture simulation with a space-domain BIEM

Mon, 06/01/2020 - 00:00
The boundary integral equation method (BIEM) is one of the important numerical techniques used to simulate geophysical phenomena including dynamic propagation, nucleation, and sequence of earthquake ruptures. ...

Realization approach of non-linear postseismic deformation model for Taiwan semi-kinematic reference frame

Mon, 06/01/2020 - 00:00
Surface displacements associated with earthquake-cycle deformation of active faults significantly influence the accuracy of geodetic datum and reference frames, especially for the Taiwan area with high plate c...

Detecting pre-eruptive magmatic processes of the 2018 eruption at Kilauea, Hawaii volcano with ambient noise interferometry

Sat, 05/30/2020 - 00:00
A sequence of eruptions in the lower East Rift Zone (LERZ) of the Kilauea, Hawaii volcano commenced in early May 2018 and caused serious damage and residential evacuation. The post-eruption drainage and collap...

Catalog of small repeating earthquakes for the Japanese Islands

Fri, 05/29/2020 - 00:00
Groups of repeating earthquakes, which occur in approximately the same location and possess a similar focal mechanism, have been extracted in various tectonic environments worldwide. Their recurrence interval ...

Three-dimensional topographic relief of the oceanic crust may control the occurrence of shallow very-low-frequency earthquakes in the Nankai Trough off Kumano

Wed, 05/27/2020 - 00:00
To explore a local relationship between geological structures and the occurrence of very-low-frequency earthquakes (VLFEs), a particular class of slow earthquakes with characteristic periods of 10–100 s, we in...

Penetration electric fields observed at middle and low latitudes during the 22 June 2015 geomagnetic storm

Tue, 05/26/2020 - 00:00
Prompt penetration electric fields were detected during the intense geomagnetic storm on 22 June, 2015 by the HF Doppler sounders at middle and low latitudes; Prague (Czech Republic), Iitate, Oarai, Onna (Japa...

Tectonic plates in 3D mantle convection model with stress-history-dependent rheology

Sun, 05/24/2020 - 00:00
Plate tectonics is a key feature of the dynamics of the Earth’s mantle. By taking into account the stress-history-dependent rheology of mantle materials, we succeeded in realistically producing tectonic plates...

Synthetic modelling of downhole resistivity data to improve interpretation of basin morphology from magnetotelluric inversion

Thu, 05/14/2020 - 00:00
Prospective Proterozoic units in the southern Mount Isa Province are concealed by a poorly defined extent of younger basin cover, leading to poor exploration success. Collection of a magnetotelluric (MT) surve...

Oxidation during magma mixing recorded by symplectites at Kusatsu–Shirane Volcano, Central Japan

Wed, 05/13/2020 - 00:00
Kusatsu–Shirane Volcano is an active Quaternary andesitic-to-dacitic volcano located in the Central Japan Arc. We conducted a detailed petrological investigation of orthopyroxene (opx)–magnetite (mt) symplecti...

Landslide detection in mountainous forest areas using polarimetry and interferometric coherence

Wed, 05/13/2020 - 00:00
The cloud-free, wide-swath, day-and-night observation capability of synthetic aperture radar (SAR) has an important role in rapid landslide monitoring to reduce economic and human losses. Although interferomet...

Coulomb stress change on inland faults during megathrust earthquake cycle in southwest Japan

Wed, 05/13/2020 - 00:00
In the subduction zone, megathrust earthquakes may modulate the shallow crustal seismicity in the overriding plate. Historical documents indicate the frequent occurrence of large shallow crustal earthquakes in...

Determination of the dipping direction of a blind reverse fault from InSAR: case study on the 2017 Sefid Sang earthquake, northeastern Iran

Tue, 05/12/2020 - 00:00
Determining the fault parameters of an earthquake is fundamental for studying the earthquake physics, understanding the seismotectonics of the region, and forecasting future earthquake activities in the surrou...

Frictional and structural controls of seismic super-cycles at the Japan trench

Mon, 05/11/2020 - 00:00
The diverse mechanical behaviors of subduction zones during the seismic cycle emerge from the nonlinear dynamics of a complex mechanical system with interacting brittle and ductile deformation. The 2011 Tohoku...

Inelastic strain in the hypocentral region of the 2000 Western Tottori earthquake (M 7.3) inferred from aftershock seismic moment tensors

Mon, 05/11/2020 - 00:00
Inelastic deformation due to seismic activity is an important signal that reflects fault evolution. In particular, aftershock sequences indicate the evolution of damage in a medium that has experienced a large...

Long-term slow slip events along the Nankai trough delayed by the 2016 Kumamoto earthquake, Japan

Thu, 05/07/2020 - 00:00
The Global Navigation Satellite System network in Japan detected transient crustal deformation along the Nankai trough, Japan, from June 2018. Time-dependent inversion analysis shows that a long-term slow slip...

Evaluation of a method to retrieve temperature and wind velocity profiles of the Venusian nightside mesosphere from mid-infrared CO2 absorption line observed by heterodyne spectroscopy

Thu, 05/07/2020 - 00:00
We evaluated a method for retrieving vertical temperature and Doppler wind velocity profiles of the Venusian nightside mesosphere from the CO2 absorption line resolved by mid-infrared heterodyne spectroscopy. The...

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