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  • April 22, 2021

[Frontier Letter] MOWLAS: NIED observation network for earthquake, tsunami and volcano

National Research Institute for Earth Science and Disaster Resilience (NIED) integrated the land observation networks established since the 1995 Kobe earthquake with the seafloor observation networks established since the 2011 Tohoku earthquake and tsunami as MOWLAS (Monitoring of Waves on Land and Seafloor) in November 2017. The purpose of MOWLAS is to provide comprehensive, accurate, and rapid observation and monitoring of earthquake, tsunami, and volcano events throughout Japan and its… Read more

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  • April 22, 2021

[Frontier Letter] Detection of triggered shallow slips caused by large earthquakes using L-band SAR interferometry

Fujiwara et al. (2020) studied the distribution of crustal deformation caused by large earthquakes in detail using space-borne SAR interferometry and identified many displacement lineaments. Large earthquakes tend to trigger shallow slips on other surrounding pre-existing faults. Subsequently, these triggered shallow slips release accumulated strain, which in turn results in displacement lineaments. The occurrence of such passive faulting creates weak, mobile fault planes that repeatedly move at the same location.… Read more

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  • April 22, 2021

[Frontier Letter] Volcanological challenges to understanding explosive large-scale eruptions

Large-scale explosive eruptions with caldera collapse are one of the causes of the global-scale disasters that modern society has never experienced. To understand the process of caldera-forming explosive eruptions and prepare for the potential risks, we need to understand the accumulation process of voluminous magma in the Earth's crust and the triggering mechanism of sudden destabilization and eruption of magmas from the magma chamber. This requires interdisciplinary researches that integrates… Read more

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  • November 12, 2019

[Frontier Letter] Occurrence of F region echoes for the polar cap SuperDARN radars

The quality of global-scale ionospheric plasma circulation maps provided by the SuperDARN radars depends strongly on the number of detected echoes. Over the last decade of relatively low solar activity, the best SuperDARN echo occurrence rates are in the polar cap. Koustov et al. (2019) show that SuperDARN radars in both the North and South hemispheres have similar patterns in echo occurrence over the daily, seasonal, and solar cycles. Many… Read more

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  • November 4, 2019

[Frontier Letter] Structural heterogeneity in and around the fold-and-thrust belt of the Hidaka Collision zone, Hokkaido, Japan and its relationship to the aftershock activity of the 2018 Hokkaido Eastern Iburi Earthquake

The 2018 Hokkaido Eastern Iburi Earthquake (M=6.7) occurred at a very deep depth (~37 km) beneath the foreland fold-and-thrust belt of the Hidaka Collision Zone, Hokkaido, Japan. From the previously acquired controlled source seismic data, Iwasaki et al. (2019) revealed the detailed structure beneath this fold-and-thrust belt and its relationship with the aftershock activity of this earthquake. Relocated aftershocks are at depths of 7-45 km with steep geometry, extending to… Read more

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  • August 8, 2019

EPS Express Letters

Express Letters provide you with a fast turnaround time, while maintaining rigorous peer review. The turnaround time on average is 43 days from submission to first decision. The following list gives you the all-time fastest Express Letters in each section published from January 2017 to July 2019 (77 papers in total). Click thumbnails to access article pages. Section 1. Geomagnetism Komori et al. (2017): Depth profiles of resistivity and spectral… Read more

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  • July 15, 2019

[Frontier Letter] Temporal variations in discharge rate and component characteristics of tephra-fall deposits during the 2014–2015 eruption of Nakadake first crater, Aso Volcano, Japan

Miyabuchi and Hara (2019) present the distribution, discharged mass, and components of tephra-fall deposits to examine the sequence and characteristics of the 2014-2015 magmatic eruption at Nakadake first crater, Aso Volcano, SW Japan. Continuous monitoring of tephra deposits and visual observation of eruptive phenomena combined with geophysical observations, would provide new insights into magmatic and eruptive processes on small but long-lasting activities at Nakadake Volcano and other similar basaltic to… Read more

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