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Full Description
This book summarizes the state-of-the-art studies on the Asama Volcano, from the points of view of geology, geophysics, geochemistry, petrology, and volcanic hazard. The Asama Volcano, which is one of the most active volcanoes in Japan, sits 140 km northwest of the Tokyo metropolitan region. It erupted explosively in 1108 and 1783, and numerous volcanic activities including detonative Vulcanian eruptions were frequently reported, especially in the mid-twentieth century. It continues to show smaller but significant volcanic activities including those in 2004, 2008, and 2009. Therefore, it still has the potential of being a volcanic hazard to the region.
The history of scientific research of the volcano dates back to the late-nineteenth century, and it is one of the first volcanoes to be monitored by geophysical instruments, including seismic, geodetic, and electromagnetic methods. This book summarizes the past observations and provides a comprehensive overview.
Concerning geology, the high-resolution reconstruction of volcanic history and evolution was carried out on the basis of recent extensive trenching and dating. This geological work makes a significant contribution to updating our understanding of the volcano and also allows the suggestion of a new "Asama-type eruption" style.
Contents
Part I:Tectonic Setting.- Deep Seismic Structure, Plate Geometry, and Magmatism around Asama Volcano.- The Deflection of Volcanic Front around Asama Volcano and Deep Dehydration beneath the Noto Peninsula: Constraints from Regional Magma Geochemistry.- Part II: Geology.- Geologic Back-Ground: Basement Rocks of Asama Volcano.- Geology of Eboshi-Asama Volcano Group.- Geology of Asama-Kurofu Volcano.- Geology of Asama-Sennin Volcano.- Multiple Sector Collapses of Asama-Sennin and -Kurofu Volcanoes and Associated Large-scale Debris Avalanche Deposits.- Geology of Asama-Hanareyama and -Hotokeiwa Volcanoes.- Geology of Asama-Maekake Volcano.- High-Resolution Reconstruction of the Eruptive History of Asama-Maekake Volcano Based on the Stratigraphy of Pyroclastic Fall Deposits - Example of Geological Survey Utilizing Extensive and Numerous Trench Excavations.- AD1783 Large-scale Eruption of Asama-Maekake Volcano.- Large-scale Eruptions of Asama-Maekake Volcano in the 12th Century.- Petrology of Magmatic Plumbing System of Asama-Maekake Volcano.- Part III: Geophysics and Geochemistry.- History of Seismic Observation and Traditional Classifications of Seismic Signals in Asama Volcano.- Eruption Activity of Asama Volcano from 2004 to 2015 and Volcanic Earthquake.- Volcanic Events and Gas Emission at Asama Volcano.- Shallow Seismic Structure of Asama Volcano.- Upper-Crustal Seismic Structure of Asama Volcano.- Levelling Observation of Asama Volcano.- Ground Deformation at Asama Volcano Measured by Geodetic Data.- Electrical Resistivity of Asama Volcano.- Gravity Change of Asama Volcano.- Muography of Asama Volcano.- Degassing Activity of Asama Volcano.- Sulfur Concentration in Magmas from Asama Volcano.- Magma Pathway of Asama Volcano.- Prediction of Volcanic Eruptions at Asama Volcano.- Part IV: Mitigation and Hazard.- Mitigation of Volcanic Hazards of Asama Volcano.- Volcanic Disasters of the Great Eruptions in AD1108 and AD1783 of Asama Volcano Revealed by Archeological and Historical Research.
