Nội dung được dịch bởi AI, chỉ mang tính chất tham khảo
Ảnh hưởng của chuyển động đất theo kiểu xung do hiệu ứng định hướng đến việc kích hoạt lở đất
Tóm tắt
Các trận lở đất do động đất gây ra đe dọa đến tính mạng con người, cơ sở hạ tầng và môi trường. Vào năm 2016, trận động đất Kumamoto với độ lớn Mw 7.1 đã gây ra nhiều trận lở đất rộng rãi. Các trận lở đất này chủ yếu tập trung ở khu vực Aso, nơi có sự di chuyển theo hướng trước của đứt gãy. Trong khi đó, một số chuyển động mặt đất theo kiểu xung (PLGM) đã được phát hiện ở khu vực này. Để làm rõ lý do cho những trận lở đất trong sự kiện Mw 7.1, chúng tôi đề xuất hai giả thuyết: (1) Xung tốc độ của PLGM là yếu tố then chốt trong việc kích hoạt lở đất. (2) Ở hướng trước của đứt gãy, khu vực có PLGM đáng kể do hiệu ứng định hướng tương ứng với khu vực lở đất rộng rãi. Trong nghiên cứu này, trước tiên, xung tốc độ của PLGM đã được xác định và phân tích. Sau đó, để xác thực giả thuyết đầu tiên, sự cố dốc dưới các chuyển động mặt đất khác nhau được phân tích thông qua phân tích biến dạng gián đoạn (DDA). Thêm vào đó, để xác thực giả thuyết thứ hai, các chuyển động mặt đất do Mw 7.1 gây ra được mô phỏng bằng phương pháp sai phân hữu hạn (FDM). Hơn nữa, sự liên quan giữa phân bố các tham số chuyển động mặt đất và lở đất rộng rãi được phân tích. Kết quả cho thấy, nghiên cứu này chỉ ra rằng xung tốc độ với năng lượng lớn hơn có đóng góp đáng kể cho lở đất. Hơn nữa, nghiên cứu này cũng xác thực hiệu ứng định hướng đặc trưng trong sự kiện Mw 7.1, điều này gây ra nhiều PLGM và tăng thêm khả năng xảy ra lở đất. Hơn nữa, các tham số chuyển động mặt đất được mô phỏng có ý nghĩa hơn trong khu vực lở đất rộng rãi. Những kết quả này hỗ trợ mạnh mẽ cho hai giả thuyết. Nghiên cứu này cung cấp một phương pháp phân tích tính ổn định của dốc xem xét PLGM do hiệu ứng định hướng gây ra. Hy vọng rằng nghiên cứu này có thể mang lại lợi ích lớn cho việc dự đoán lở đất tiềm năng trong các khu vực gần đứt gãy.
Từ khóa
#lở đất #chuyển động mặt đất #xung tốc độ #động đất #hiệu ứng định hướngTài liệu tham khảo
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