AUTHOR=Hu Tiantian , Fan Xiaoping , He Yicheng , Yang Longshuai , Yang Congjie , Jiang Pengcheng , Liu Zhiwen , Xia Ziyan , Xu Menghui , Wu Yuhan TITLE=Velocity structure of crust and mid-strong earthquake preparation characteristics in the Huoshan region, East China JOURNAL=Frontiers in Physics VOLUME=12 YEAR=2024 URL=https://www.frontiersin.org/journals/physics/articles/10.3389/fphy.2024.1502248 DOI=10.3389/fphy.2024.1502248 ISSN=2296-424X