论文部分内容阅读
利用合成孔径雷达干涉测量的短基线技术对汶川震前的地表形变进行面状监测。获取的是日本卫星L波段的ALOS PALSAR传感器拍摄的卫星数据。在Gamma软件处理下,将2007年6月至2008年5月的时隔320 d的6景数据,利用stacking技术得到汶川震中地区在震前一年内的变形速率。变形特征表明,沿着汶茂断裂带呈“凸”字形分布特征,断裂带处最大隆升值达24 cm,断层两侧出现下降的趋势,在绵虒镇附近达到最大沉降值22 cm。与前人用D-InSAR所做出的研究结果相比,二者具有很好的一致性。
Surface monitoring of surface deformation before Wenchuan earthquake by using the short baseline technique of synthetic aperture radar interferometry. Obtained satellite data from the ALOS PALSAR sensor on the L band of Japanese satellites. Under the Gamma software processing, the data of 6 scenes after 320 days from June 2007 to May 2008 were collected by stacking technique to get the deformation rate of the Wenchuan epicenter within one year before the earthquake. Deformation features indicate that the “uplifted” zonal distribution along the Wenmao fault zone has a maximum uplift value of 24 cm at the fault zone and a downward trend on both sides of the fault, reaching a maximum settlement value of 22 cm near the town of Mianpi. Compared with the previous results of D-InSAR, the two have good consistency.