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???????????48??IGS?2009-2011??????????????????ZTD?????????????EGNOS???????ZTD???????????????????????1??????????????????IGS?????ZTD??EGNOS???????ZTD???????????????-0.18 cm??5.98 cm?????й?????????0.81 cm??6.13 cm??2????????????????????????仯????????????????＾??С??????????????????????С??3????????????????γ?????仯???????????????????????????γ????????????????????????????????γ????????????????????仯????С??4:???????????γ?????????????????????????????????仯?????     

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??????8.0????????????????????????????????????λ??????????????η????????ν??????????????????8.0??????GPS??InSAR????α??????????????????????????????????????????1?????????????????GPS??InSAR??????????α????????????97.27%;2??????????????????????????????????????0??20 km??????????????λ???????????????????????????????????????????0??20 km???????????????????10 m????????10??15 km?????????????6.5 m??3??????????????????????????????????????????????????????????103??????????????????????121????????????????????138??????????????????????????105??4?????????????????8.7??10 ²⁰ Nm???????Mw7.9??     

汶川8.0级地震前龙门山断裂带地倾斜面变化特征研究

探讨汶川8.0级地震前龙门山断裂带区域地倾斜面的形变特征,分析表明震前区域地倾斜面在水平形变变化上呈现由龙门山断裂带两侧向中央挤压特征;垂直形变变化呈现龙门山断裂带西北侧的后山断裂持续抬升隆起,东南侧前山断裂的雅安等区域持续下沉特征;震源附近的汶川区域地倾斜面从2005年下半年至2006年出现了垂直和水平形变显著加速增...     

GPS���Ͻ�ʾ���봨8.0������ǰ�ؿǶ�̬�ݻ�����

?????й????1999??????3????ε?GPS???????о?????8.0?????????????????????о?????????1)?????????????????????????????????????????????????????????壬???и????????????????????????2)???????????????????????????????????????????????????????????????????????????????????????????????????3)???????????μ?6?????????????????????????????????????????????????????????????     

GPS资料揭示的汶川8.0级地震前地壳动态演化特征

利用中国大陆1999年以来3个时段的GPS速度场,研究了汶川8.0地震前的地壳动态演化特征。研究结果显示：1)汶川地震发生在区域地壳挤压运动明显受阻的区域,孕震区附近存在一较大的障碍体,震中附近断层多年来处于强闭锁状态;2)随着地震发生日期的临近,震中西侧压性区表现出明显的向东逐步扩张态势,局部地区主压应变方向出现向北偏转,右旋剪切作用明显增强;3)汶川地震同震变形及6级以上余震分布表现出的区段性与断裂带及附近分段性运动变形特征密切相关。     

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?????????????????????GPS??????????????“5.12”??Ms8.0?????“4.20”??7.0??????????????????????????α????????????????1??????????????????????????????“?????”???Σ?2????????Ms8.0???????????????????ε?????????????????????ε??????????????????????????????Ms7.0??????λ??????????“?????”???伷???????????????30 nanostrain/a??????????????????????????????????????60 nanostrain/a???????????????????????????????????????????????????????????????????????λ?????????????????????????α??????????????????????????     

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???????????1990??1997??1997??2003??1994??2006??????????????????????λ??????о???Ms8.0???????????Ms6.1?????????????????????????????????????????????????????????????????????????μ???????????????????????????????????????μ??Χ??????????????????10???????????????????????????????????????????????????????1997??2003?????????????????????????????????????????     

GiT-based structural geologic feature analysis of the southern segment of Longmenshan fault zone for earthquake evidence

The Longmenshan fault is a thrust fault which runs along the base of the Longmen Mountains in Sichuan province,southwestern China.The southern segment of the fault had two distinct responses to the Ms 8 Wenchuan and Ms 7 Lushan earthquakes.This study determines characteristics of the structural geology of the Longmenshan fault to evaluate how it influenced the two aforementioned earthquakes.This research was done within a Geoinformation Technologies(Gi T) environment based on multi-source remote sensing and crustal movement data extracted from the Global Positioning System(GPS).The spatial distribution of the southern segment of the Longmenshan fault zone was comprehensively analyzed to study both earthquakes.The study revealed that the Wenchuanand Lushan earthquakes occurred on two relatively independent faults.In addition,there was a nearly constant-velocity crustal movement zone between the two epicenters that probably had a compressive stress with slow motion.Furthermore,the central fault and a mountain back fault gradually merged from north to south.The Lushan earthquake was not an aftershock of the Wenchuan earthquake.The research showed that fault zones within 30–50 km of State Highway 318 are intensive and complex.In addition,crustal movement velocity decreased rapidly,with a strong multi-directional shear zone.Thus,activity in that zone was likely stronger than in the northern part over the medium to long term.     

汶川 Ms8.0地震同震倾斜应变变化分析

对汶川地震震中附近450 km范围内倾斜仪、应变仪记录到的同震变化做了筛选统计,并根据弹性半无限空间矩形位错模型,分别采用远场地震波资料、近场大地测量资料反演的同震滑移分布模型,正演计算震中附近台站的同震倾斜、应变变化.通过对实际观测与模拟计算结果的比较,初步表明:实际观测的同震倾斜变化方向与模拟计算结果存在75%的一致性,实际观测的同震倾斜变化比模拟值大约1～2个量级;实际观测的同震应变方向与模拟计算结果仅有33.3%的一致性,实际观测的同震应变变化与模拟计算值相当或仅大1个数量级.