Browse Articles
Discover research articles across all indexed journals
Magmatic evolution of the Kikai caldera revealed by zircon triple dating and its chemistry
Abstract Reconstructing the volcanic history of the Kikai caldera, a large active volcano that produced a ~ 160 km3 eruption at 7.3 ka off the southern coast of Kyushu Island (southwest Japan), is crucial to assess potential future volcanic hazards at both regional and global scales. However, revealing its volcanic history before the 7.3 ka eruption has been challenging due to the caldera being mostly submerged. In this study, we present evidence that the Kikai caldera erupted a geochemically distinct silicic lava at ~ 250 ka by using zircon triple (U-Pb, Th-Pb, U-Th) dating and its chemistry. The presence of 1.5–1.0 Ma zircons in the 7.3 ka eruption deposits suggests that zircon crystallization in the Kikai caldera began during this period. We further infer large eruptions occurred around 0.7–0.6 Ma, suggesting that the Kikai caldera may have experienced at least 5 major eruptions during its 1.0–1.5-million-year magmatic evolution.
Author Correction: Common and rare variant associations with clonal haematopoiesis phenotypes
Swin-transformer for weak feature matching
Clinical significance of PCT, CRP, IL-6, NLR, and TyG Index in early diagnosis and severity assessment of acute pancreatitis: A retrospective analysis
The association of gut microbiota, immunocyte dynamics, and protein–protein ratios with tuberculosis susceptibility: a Mendelian randomization analysis
An amplification mechanism for weak ELF magnetic fields quantum-bio effects in cancer cells
A Markov decision optimization of medical service resources for two-class patient queues in emergency departments via particle swarm optimization algorithm
Predicting academic procrastination of students based on academic self-efficacy and emotional regulation difficulties
YAT2150 is irresistible in Plasmodium falciparum and active against Plasmodium vivax and Leishmania clinical isolates
Rapid change in red cell blood group systems after the main Out of Africa of Homo sapiens
Approaches for estimating the unsaturated hydraulic conductivity of compacted quartz sand via particle packing theory
Comparing clinical only and combined clinical laboratory models for ECPR outcomes in refractory cardiac arrest
Development of a fixed-order $$H_{\infty }$$ controller for a robust P&O-MPPT strategy to control poly-crystalline solar PV energy systems
Enhancing the performance of polyfarnesene-based bio-rubbers with surface-modified cellulose nanocrystals and nanofibers
Changes in hairiness of woven fabrics at the production and finishing stages
Correlation between neutrophil percentage-to-albumin ratio and all-cause and cerebrovascular mortality among hypertension patients
Long noncoding RNA DHRS4 antisense RNA 1 suppresses osteosarcoma cell proliferation and promotes apoptosis through a competitive endogenous RNA mechanism
De novo transcriptome profiling revealing genes involved in piperine biosynthetic pathway in Piper longum L
The Way to a Patient’s Heart — Vascular Access in Cardiac Arrest
Cumulative damage characteristics of tunnel initial support concrete under blasting load
Abstract Relying on the Beijing-Zhangjiakou high-speed railway Cao Mao Shan tunnel project, blasting vibration monitoring and sound wave testing experiments were carried out. The monitoring results show that the blasting vibration velocity corresponding to the initial support satisfies the Sadowski formula. The results of the sonic test show that with the increase of blasting times, the cumulative damage increases gradually, but the blasting damage increment shows a downward trend. In addition, as the blasting distance decreases, the blasting cumulative damage effect is significant. Through data analysis and curve fitting, the cumulative damage range R cr and critical blasting vibration velocity PPV cr corresponding to blasting construction are obtained respectively. The numerical analysis results show that there is a good exponential function relationship between the cumulative damage range R cr and the corresponding critical blasting vibration velocity PPV cr . The purpose of quantitative control of blasting damage can be achieved by setting the corresponding vibration velocity threshold.