Subsidence associated with the LUSI mud eruption,East Java,investigated by SAR interferometry     

Yo Fukushima  Jim Mori  Manabu Hashimoto  Yasuyuki Kano 《Marine and Petroleum Geology》2009

A mud volcano LUSI initiated its eruption on 29 May 2006, adjacent to a hydrocarbon exploration well in East Java. Ground subsidence in the vicinity of the LUSI eruptive vent was well recorded by a Synthetic Aperture Radar (SAR) PALSAR onboard the Japanese ALOS satellite. We apply an Interferometric SAR (InSAR) technique on ten PALSAR data scenes, acquired between 19 May 2006 and 21 May 2007, in order to obtain continuous maps of ground displacements around LUSI. Although the displacements in the area closest to the eruptive vent (spatial extension of about 1.5 km) are not detectable because of the erupted mud, all the processed interferograms indicate subsidence in an ellipsoidal area of approximately 4 km (north–south) × 3 km (east–west), centered at the main eruptive vent. In particular, interferograms spanning the first four months until 4 Oct. 2006 and the subsequent 46 days between 4 Oct. 2006 and 19 Nov. 2006 show at least about 70 cm and 80 cm of displacements away from the satellite, respectively. Possible causes of the subsidence, i.e., 1) loading effect of the erupted mud, 2) creation of a cylindrical mud conduit, and 3) pressure decrease and depletion of materials at depth, are investigated. The effects of the first two causes are found to be insufficient to explain the total amount of subsidence observed in the first six months. The third possibility is quantitatively examined using a boundary element approach by modeling the source of deformation as a deflating oblate spheroid. The spheroid is estimated to lie at depths of a few hundred to a thousand meters. The estimated depths are significantly shallower than determined from analyses of erupted mud samples; the difference is explained by presence of significant amount of inelastic deformation including compaction and downward transfer of material.  相似文献   

InSAR技术及其在地质灾害中的应用   总被引：1，自引：0，他引：1  

侯建国  张勤  杨成生 《测绘与空间地理信息》2007,30(6):28-30

InSAR是在太空对地球进行3维成像技术,它标志着空间遥感从2维信息获取进入到3维信息获取的新阶段,也为大地测量带来了一场革命。该技术为地质灾害的研究提供一个全新的工具。运用InSAR和D-In-SAR技术进行地面微位移监测,是近年来发展起来并得到日益重视的新方法。本文例举了InSAR技术在地震、火山喷发和滑坡等地质灾害应用的实例。表明它在形变监测研究中有广阔的应用前景,具有不可替代的优势。  相似文献   

Observations of Rotating Jets of Carbon Monoxide in Comet Hale–Bopp with the Iram Interferometer     

Henry  Florence  Bockelée-Morvan  Dominique  Crovisier  Jacques  Wink  Jörn 《Earth, Moon, and Planets》2002,90(1-4):57-60

CO was observed on March 11, 1997 in comet Hale–Bopp with theIRAM Plateau de Bure interferometer. The maps show evidence for asymmetrical patterns, due to the Existence of CO jets. Analysis of the spectra and their velocity shifts shows that there is a spiral CO jet rotating in a plane almost perpendicular to the sky plane.This is the first time that rotating jets are observed for parent molecules.We have developed a 3-D model simulating rotating spiral jets of CO gas.We present here the comparison between the observations and our model.  相似文献   

激光全息干涉法研究混凝土的损伤演化规律   总被引：1，自引：0，他引：1  

王观石  胡世丽 《江苏地质》2005,29(4):242-245

将实时激光全息于涉试验系统与静态承压装置相结合，在单轴连续静态荷载作用下分别对不同混凝土试块连续进行激光实时全息于涉试验动态观测，同时测量受压混凝土的应力应变关系曲线，通过数码摄像机将全息于涉条纹图传输至计算机，获取实时全息于涉条纹图。根据于涉条纹的分布规律及其路径，直观地再现了混凝土的损伤演化过程，描述了混凝土构件的损伤演化断裂特征。为混凝土结构损伤分析与诊断的深入研究探索出了有效的试验方法。  相似文献   

差分干涉SAR冻土形变检测方法研究   总被引：12，自引：4，他引：8  

李震  李新武  刘永智  任鑫 《冰川冻土》2004,26(4):389-396

季节性冻融导致的地表形变是冻土地区工程建设的主要病害,冻土的冻胀和融沉是影响青藏公路以及目前建设的青藏铁路路基稳定的重要因素.近年来,差分干涉测量技术已成为地表形变测量和监测的重要工具.基于重复轨道的ERS 1/2雷达图像,研究了利用干涉SAR技术探测冻土形变的方法,经过对引入DEM差分干涉SAR技术的处理和分析,得到研究区冻土形变结果.通过与实测数据比较,表明重轨差分干涉测量可以精确地探测冻土表面形变,可用于青藏铁路冻土形变监测.  相似文献   

基于SVI方法的折射波信噪比改善效果研究     

邵宇蓝  李唐律  廖仪  童思友  吴志强 《海洋地质前沿》2014,30(5):52-57

折射波在地震勘探中有非常重要的作用,但由于近地表噪声等因素影响,折射波在地震记录上往往能量较弱,信噪比较低。因此,Bharadwaj、Mallinson等提出了超虚拟折射干涉法(Supervirtual refraction interferometry-SVI),用于提高折射波的信噪比。在此基础上,结合正演模拟数据和实际资料,对该方法的抗噪性以及相关叠加道数、褶积叠加道数等因素对处理效果的影响进行了研究,结果表明,对于信噪比0.2的资料,在满足一定相关叠加道数和褶积叠加道数时,使用本方法后能使信噪比得到显著增强。  相似文献   

Study on virtual source method under complex overburden in horizontal well     

WANG Le  HAN Liguo  LIU Yanqiu  XU Zhuo 《世界地质(英文版)》2014,17(2):115-119

In conventional seismic exploration,complex overburden prevents us from imaging the deeper under- ground structure,because near-surface velocity model cannot be efficiently simplified and accurately estab- lished． The virtual source method provides a promising solution,which images below a complex overburden without the knowledge of overburden velocities and near-surface changes． In this paper,the authors simulate the forward modeling under complex overburden with sources on the surface and receivers in the horizontal well, and reset the real sources into the horizontal well using the virtual source method,which subtly avoid the distor- tion effects of the complex overburden． Finally the underground structure can be imaged using Kirchhoff migra- tion,so the feasibility and advantages of the virtual source method are verified．  相似文献   

2010年青海玉树Ms7.1级地震地表破裂带和形变特征分析   总被引：6，自引：2，他引：4       下载免费PDF全文

张桂芳  屈春燕  单新建  刘云华  宋小刚 《地球物理学报》2011,54(1):121-127

通过对SPOT卫星影像上地表破裂的目视解译,以及对ALOS PALSAR卫星数据进行D-InSAR形变提取和分析,结合地震活动性、震源机制、活动构造等资料,确定了发震断层空间分布、断层性质和同震形变场分布特征.结果显示,玉树地震发生在甘孜-玉树断裂带上,总体走向约为300°,断层近乎直立.根据相干性强弱将Ⅰ区地表破裂划...  相似文献   

国际上长基线光干涉测量进展评述     

徐家岩 《时间频率学报》1992,15(2):139-150

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First observations with the 64-m Kalyazin telescope included in a ground-based—space interferometer: The quasar 3C 147     

V. I. Slysh  M. V. Popov  B. Z. Kanevskii  A. I. Smirnov  A. V. Kovalenko  Yu. P. Ilyasov  V. V. Oreshko  B. A. Poperechenko  H. Hirabayashi  K. M. Shibata  E. B. Fomalont 《Astronomy Letters》2001,27(5):277-283

The 64-m radio telescope equipped with an S-2 recording system in the town of Kalyazin was involved in an international fine-structure survey of quasars and active galactic nuclei carried out with a ground-based—space radio interferometer. The HALCA Japanese satellite in an orbit with an altitude of up to 24 000 km with an 8-m antenna was used as a space element of the interferometer. A radio image of the inner region of the CSS-type quasar 3C 147 was obtained with an angular resolution of ～0.3 mas at 6 cm. The image exhibits a core and several jet components mostly arranged in the main jet direction, but one of the components moves across the jet. No evidence was found for the superluminal separation of jet components. The estimated brightness temperature,～10¹¹ K, is consistent with the theoretical limit imposed by synchro-Compton radiation.  相似文献