Biến dạng mặt đất liên quan đến hệ thống thủy nhiệt áp suất cao tại núi lửa Azuma (Nhật Bản) được tiết lộ bởi dữ liệu InSAR

Earth, Planets and Space
Yuji Himematsu1, Taku Ozawa2
1Earthquake Research Institute, The University of Tokyo, Tokyo, Japan
2National Research, Institute for Earth Science and Disaster Resilience, Tsukuba, Japan

Tóm tắt

Tóm tắtBiến dạng tại các núi lửa đang hoạt động là những chỉ số cho tình trạng áp suất quá mức trong lòng đất, được biết đến như một hiện tượng xảy ra trước các vụ phun trào. Áp suất quá mức núi lửa được tạo ra bởi việc bơm dung dịch magma, magma tích tụ, hoặc nguồn nhiệt từ độ sâu lớn hơn. Núi lửa Azuma (Nhật Bản) đã trải qua một số đợt bất ổn núi lửa với sự gia tăng trong hoạt động địa chấn ở độ sâu của hệ thống thủy nhiệt, cho thấy khả năng gia tăng các vụ phun trào phreatic. Dữ liệu chuỗi thời gian từ radar xuyên bề mặt tổng hợp giao thoa, liên quan đến các đợt bất ổn xảy ra trong giai đoạn 2014–2015 và 2018–2019, đã tiết lộ những biến đổi không gian-thời gian của các đợt biến dạng, tập trung xung quanh miệng núi Oana, miệng hầm hoạt động nhất của núi lửa Azuma. Hình học tốt nhất đã được mô hình hóa của nguồn áp suất kéo dài cho sự biến dạng địa phương có phần nghiêng giống như hướng và góc của độ dốc địa hình phía trên xung quanh miệng Oana, cho thấy sự tồn tại của các cấu trúc phân lớp liên quan đến địa hình trong hệ thống thủy nhiệt. Ngược lại, biến dạng rộng hơn liên quan đến sự bất ổn 2014–2015 được giải thích bằng áp suất quá mức từ một nguồn phẳng nằm ngang ở độ sâu 360–1500 m dưới mực nước biển, cho thấy độ sâu tương tự của đỉnh như thể hiện bởi các nghiên cứu trước đó về các thân dẫn điện kém hoặc thân có độ nhớt thấp. Các đợt bất ổn do đó được giải thích chủ yếu là kết quả từ nguồn cung cấp dung dịch magma, hoặc sự chuyển giao nhiệt từ độ sâu lớn hơn. Nghiên cứu của chúng tôi giúp hiểu rõ cấu trúc nông của hệ thống núi lửa này và góp phần đánh giá khả năng xảy ra các vụ phun trào trong tương lai tại núi lửa Azuma. Hình tóm tắt trực quan

Từ khóa


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