Geological Survey of Japan

Olivine-hosted melt inclusions provide insights into primitive magma compositions driving young eruptions from Red Crater, Tongariro (New Zealand)

Abstract Volcanism at continental arcs is ultimately driven by mantle-derived magmas; however, erupted compositions are typically overprinted by crustal interactions during ascent, obscuring deeper signatures. We target olivine and their melt inclusions (MI) in basaltic andesite...

Stress field estimation and evaluation in eastern Hokkaido, northernmost Japan

In eastern Hokkaido, a volcanic front extends in the northeast–southwest direction, and small eruptions have occurred in recent years. Although eastern Hokkaido is a low-seismicity region, we estimated the stress field using a larger dataset than those employed previously to unde...

Fluvial geomorphological development associated with MIS 5e–4 sea-level fluctuations in the lower reaches of the Kinu River, Japan

Understanding fluvial geomorphological responses to sea-level fluctuations during Marine Isotope Stage (MIS) 5 is essential for predicting future evolution of coastal lowlands under sustained high sea-level conditions. Although downstream river development since the Last Glacial...

Random forest-based lithology identification using geophysical well logging data along a borehole in a coastal aquifer in Suruga Bay, Japan

Abstract Machine learning techniques have attracted attention for lithology identification, which is fundamental for understanding geological structures. However, the efficacy of machine learning-based lithology identification, specifically in deep (several hundred meters) coasta...