基于SBAS-InSAR技术的樱岛火山形变监测

Deformation monitoring of Sakurajima Volcano based on SBAS-InSAR technique

火山喷发往往是由地壳内部岩浆活动引起的,通过监测火山区地表形变可以有效反演出地下岩浆的状态。为监测火山区地表形变,笔者选取日本樱岛火山为研究区域,采用SBAS-InSAR技术对2019—2021年间共计75景Sentinel-1A影像进行处理。结果表明,樱岛火山处于比较活跃的阶段,监测期间樱岛火山总体处于沉降状态,平均形变速率为-10.05 mm/a。最大沉降区域为火山中心地带,累积形变量为-62.72 mm,并且在时间上具有明显的季节变化特征;抬升主要发生在火山外围区域,其中最大抬升发生于樱岛东南侧,监测期间累积抬升108.71 mm。

Volcanic eruptions are often triggered by magmatic activities within the Earth s crust.Monitoring the surface deformation in volcanic regions can effectively infer the state of underlying magma.To monitor the surface deformation of the volcanic areas,Sakurajima Volcano in Japan was selected for a detailed study.We applied the SBAS-InSAR technique to process 75 Sentinel-1A images from^(2)019 to 2021.The results show that Sakurajima Volcano is in a relatively active phase,predominantly characterized by subsidence during the monitoring period,with an average deformation rate of-10.05 mm/a.The most significant subsidence was observed at the central zone of the volcano,amounting to a cumulative deformation of-62.72 mm.This area also exhibited pronounced seasonal variations.The uplift occurred mainly in the peripheral area of the volcano,with the maximum uplift occurring on the southeast side of Sakurajima,with a cumulative uplift of 108.71 mm during the monitoring period.