TS30／TM30测量机器人变形监测系统研究   总被引：1，自引：0，他引：1  

梅文胜  刘涛 《测绘信息与工程》2014,(2):45-48

针对Leica新型Ts30／TM30系列测量机器人开发了变形监测系统,该系统由内置软件和后处理软件组成,内置软件能够完成控制网自动化观测、变形点自动化观测和持续变形观测等任务,后处理软件能够利用网络远程获取测量数据,具有监测数据的管理、处理及输出等功能。经过实验测试,系统具有结构简单、多用途的特点,有良好的应用前景。  相似文献   

日本熊本地区高频衰减参数κ与V_s30统计研究          下载免费PDF全文

党鹏飞    夏松林    刘启方 《世界地震工程》2021,(3):200-206

地震工程学中高频衰减参数κ是一个重要的参数。距离为0 km处的参数κ₀在地震动模拟中最常用,其主要控制傅里叶谱在高频部分的衰减特征。计算了日本熊本地区矩震级M_w为5.0~7.1级且震中距小于250 km的81个台站水平方向的κ和V_s30（距离地表30 m深度的平均剪切波速）。在不同矩震级和不同场地距离下,用线性拟合和二次拟合统计了κ与V_s30的关系,并与全球平均水平进行了比较。结果表明:κ与V_s30呈很强的负相关性,相关性随矩震级的增大而增大,且熊本地区的κ要高于全球平均水平。矩震级较小时,二次拟合的效果好于线性拟合,建议用二次拟合的经验关系式进行κ或V_s30的估计。近场情况下,κ总体要小于远场,线性拟合与二次拟合的效果差异不大。对C类场地,拟合的κ与全球平均水平较接近。对B类场地,拟合的κ高于全球平均水平。远场情况下,二次拟合的效果好于线性拟合,但对B类和C类场地,κ均小于全球平均水平。本文的研究结果既能在随机模拟方法中结合场地的地壳放大使用来达到提高模拟精度的目的,又能为只有钻孔信息的地区提供κ的估计。  相似文献   

Vertical accuracy evaluation of SRTM-GL1, GDEM-V2, AW3D30 and CartoDEM-V3.1 of 30-m resolution with dual frequency GNSS for lower Tapi Basin India     

Akshay O. Jain  Tejaskumar Thaker  Ashish Chaurasia  Parth Patel  Anupam Kumar Singh 《国际地球制图》2013,28(11):1237-1256

Abstract

Shuttle Radar Topography Mission (SRTM-GL1), Advanced Space Borne Thermal Emission and Reflection Radiometer- Global DEM (GDEM-V2), recently released Advanced Land Observing Satellite (‘DAICHI’) DEM (AW3D30) and Indian National Cartosat-1 DEM v3 (CartoDEM-V3.1) provide free topographic data at a 30-m resolution for Indian peninsula. In this research study, the vertical accuracy of DEM is evaluated for above data-sets and compared with high accuracy dual frequency GNSS of a millimetre accuracy. The extensive field investigation is carried out using a stratified random fast static DGPS survey for collecting 117 high accuracy ground control points in a predominantly agriculture catchment. Further, the effect of land cover, slope and low-lying coastal zone on DEM vertical accuracy was also analysed and presented in this study.  相似文献   

新30号泉流量大幅度快速上升异常分析     

赵刚  汪成国 《内陆地震》2013,(3):287-290

分析了2012年7月4日～10月8日温泉地震台新30号泉水流量大幅度快速上升高值异常。结果表明,该异常是温泉生态园（黑山头）进行林木灌溉,造成山体水量增大,水随着岩石缝隙渗入泉中造成流量增大的结果。因此,温泉台新30号泉水流量高值异常是干扰异常,不是地震前兆异常。  相似文献   

地球北纬30°构造形变带讨论          下载免费PDF全文

钟嘉猷 《地质科学》2012,47(1):62-72

北纬30°构造形变带是地球形变最为活跃的区段,许多地震、电、磁等与地质演化有着直接或间接联系的"奇异现象"都发生在地球北纬20°～40°的环带上。研究表明,这主要与地球内部应力作用分布状态有关。地球作为一个球体(忽略球体的不规则性),在相对固定的旋转轴运动下,其内部应力分布形式,在南北半球的中纬度区(即20°～40°间)均为应力集中和应力转换区,使之成为地球上的"特殊地段",出现了各种物理与地质构造变迁现象。  相似文献   

Ordovician backarc‐basin metadolerite and metabasalt of the South Kitakami Terrane,Northeast Japan          下载免费PDF全文

Takayuki Uchino  Makoto Kawamura 《Island Arc》2016,25(4):274-286

Basement rocks that occur along the northern margin of the South Kitakami Terrane in Japan consist of Ordovician ultramafic rocks (Hayachine ultramafic complex), gneissose amphibolite (Kuromoriyama amphibolite), and mafic rocks (Kagura igneous rocks, KIR). The KIR are composed of metagabbro, metadolerite, metabasalt, and minor felsic–intermediate dikes. Although the KIR contain green hornblende due to metamorphism of greenschist to epidote–amphibolite facies, they rarely retain primary brown hornblende. Approximately 30% of the metabasalt shows porphyritic textures, with phenocrysts of saussuritized plagioclase and/or altered mafic minerals. The geochemistry of the common metadolerite and metabasalt of the KIR shows a tholeiite trend, a low TiO₂ content, and high Th/Nb and Ti/V ratios. The KIR are therefore indicative of a supra‐subduction zone tectonic setting, which implies a backarc origin (as also indicated by discrimination diagrams). Trace element patterns of the KIR resemble those of the backarc‐basin basalt of the Japan and Yamato basins in the Japan Sea. We propose that the KIR formed during backarc spreading from the Ordovician to Early Silurian. This view is supported by the geochemical data, the tectonic setting of the Hayachine ultramafic rocks, and the provenance of clastics within Silurian sedimentary rocks.  相似文献   

Late Holocene record of environmental changes,cyclones and tsunamis in a coastal lake,Mangaia, Cook Islands          下载免费PDF全文

Catherine Chagué‐Goff  Jordan Chi Hang Chan  James Goff  Patricia Gadd 《Island Arc》2016,25(5):333-349

A 4.3 m‐long peat sequence from the shore of Lake Tiriara, Mangaia, Cook Islands, was analyzed using an ITRAX core scanner equipped with a magnetic susceptibility meter. Variations in the elemental profiles, providing insights into long‐ and short‐term environmental changes over the last 3500 years, are supported by grain size data and diatom assemblages. The scattering ratio (Mo Inc/Mo Coh) was evaluated and found to represent a good proxy for organic matter in peat. X‐Ray Fluorescence (XRF) data were processed by principal component analysis that confirmed the distinction of biogenic and detrital phases, organic matter and elements of marine origin. The record preserved in the peat sequence includes a peatland infilling stage followed by alternating drier and wetter periods. A notable steady increase in clay associated with high counts of detrital elements from 2000–1700 cal yr BP is attributed to increased erosion, which is most probably linked with human colonization and/or more intense chemical weathering linked with a wetter climate. Freshwater gastropods (Melanoides sp.), which were possibly introduced by humans, or are native, occupied the wetland during a period of lower water level about 1000–1100 cal yr BP. Short‐term changes in the elemental profiles are often linked with slight coarsening of the inorganic fraction that is, however, only revealed after grain size analysis. Peaks in marine indicators (Br, Cl, S, and/or Ca) associated with marine‐dominated diatom assemblages most probably represent marine incursions through the underground tunnel in the makatea, a fossilized, uplifted coral limestone rim. While none of the marine event units present characteristics typical of cyclone or tsunami deposits, the concurrent or absent peak of detrital elements (Fe, Si, Rb, Ti, K) attributed to increased erosion of the volcanic cone associated with a cyclone is used to distinguish both types of events, as also suggested by principal component analysis.  相似文献   

Zircon U–Pb ages of plutonic rocks in the southern Abukuma Mountains: Implications for Cretaceous geotectonic evolution of the Abukuma Belt          下载免费PDF全文

Yutaka Takahashi  Masumi Mikoshiba  Kazuya Kubo  Hideki Iwano  Tohru Danhara  Takafumi Hirata 《Island Arc》2016,25(2):154-188

Plutonic rocks in the southern Abukuma Mountains include gabbro and diorite, fine‐grained diorite, hornblende–biotite granodiorite (Ishikawa, Samegawa, main part of Miyamoto and Tabito, Kamikimita and Irishiken Plutons), biotite granodiorite (the main part of Hanawa Pluton and the Torisone Pluton), medium‐ to coarse‐grained biotite granodiorite and leucogranite, based on the lithologies and geological relations. Zircon U–Pb ages of gabbroic rocks are 112.4 ±1.0 Ma (hornblende gabbro, Miyamoto Pluton), 109.0 ±1.1 Ma (hornblende gabbro, the Hanawa Pluton), 102.7 ±0.8 Ma (gabbronorite, Tabito Pluton) and 101.0 ±0.6 Ma (fine‐grained diorite). As for the hornblende–biotite granodiorite, zircon U–Pb ages are 104.2 ±0.7 Ma (Ishikawa Pluton), 112.6 ±1.0 Ma (Tabito Pluton), 105.2 ±0.8 Ma (Kamikimita Pluton) and 105.3±0.8 Ma (Irishiken Pluton). Also for the medium‐ to fine‐grained biotite granodiorite, zircon U–Pb ages are 106.5±0.9 Ma (Miyamoto Pluton), 105.1 ±1.0 Ma (Hanawa Pluton) and the medium‐ to coarse‐grained biotite granodiorite has zircon U–Pb age of 104.5 ±0.8 Ma. In the case of the leucogranite, U–Pb age of zircon is 100.6 ±0.9 Ma. These data indicate that the intrusion ages of gabbroic rocks and surrounding granitic rocks ranges from 113 to 101 Ma. Furthermore, K–Ar ages of biotite and or hornblende in the same rock samples were dated. Accordingly, it is clear that these rocks cooled down rapidly to 300 °C (Ar blocking temperature of biotite for K–Ar system) after their intrusion. These chronological data suggest that the Abukuma plutonic rocks in the southern Abukuma Mountains region uplifted rapidly around 107 to 100 Ma after their intrusion.  相似文献   

SHRIMP U–Pb zircon dating of the Kinshozan Quartz Diorite from the Kanto Mountains,Japan: Implications for late Paleozoic granitic activity in Japanese Islands          下载免费PDF全文

Masatsugu Ogasawara  Mayuko Fukuyama  Kenji Horie 《Island Arc》2016,25(1):28-42

The new result of SHRIMP U–Pb zircon dating of the Kinshozan Quartz Diorite from the Kanto Mountains, Japan, provides 281.5 ± 1.8 Ma. The age is 30 m.y. older than the available age of the Kinshozan Quartz Diorite obtained by hornblende K–Ar method. The new U–Pb zircon age represents the time of crystallization of the Kinshozan Quartz Diorite. The hornblende K–Ar age indicates the time that the Kinshozan Quartz Diorite cooled down to 500 °C which is the closure temperature of the systematics. Permian granites are found in small exposures in Japan, and frequently referred to as 250 Ma granites. The Kinshozan Quartz Diorite is considered as a type of the 250 Ma granites, and the age was influential in establishing a model of Paleozoic tectonic evolution for the Japanese Islands. The new age of the Kinshozan Quartz Diorite provides the opportunity to re‐examine the model. The Kinshozan Quartz Diorite and other Permian granites in the south of the Median Tectonic Line of Japan were constituents of the Paleo‐Ryoke Belt. The geochemical characteristics of the granitic rocks in the Paleo‐Ryoke Belt indicated that the granitic rocks were formed in a primitive island arc environment, and the new trace element data also support this interpretation. Examination of the available data and results of the present study suggests the late Paleozoic granitic activity in Japan as follows. At about 310–290 Ma, arc magmatism generated adakitic granites and other granites in the South Kitakami Belt. Quartz diorite and tonalites of primitive characteristic, such as the Kinshozan Quartz Diorite and granites in the Maizuru Belt appear to have been formed at the immature island arc, and accreted to the Japanese Islands at the end of Paleozoic or early Mesozoic era. During 260–240 Ma, granitic activity took place in the Hida and Maizuru Belts as a part of the Asian continent.  相似文献   

首套全球30 m分辨率土地覆被产品区域尺度精度评价——以河南省为例   总被引：1，自引：0，他引：1  

黄亚博  廖顺宝 《地理研究》2016,35(8):1433-1446

以河南省为研究区,对全球首套30 m分辨率土地覆盖产品GlobleLand30进行区域尺度精度评价。首先,以中国1\begin{array}{c}:\end{array}10万土地利用数据（CHINA-2010）为参考,分析两种产品的空间一致性;而后,通过Google Earth样本分析GlobleLand30在空间不一致区域的制图精度;最后,利用野外实地考察样本对GlobleLand30进行总体精度评价,并从土地覆被复杂度、高程等方面分析影响精度的原因,结果表明：① GlobleLand30与CHINA-2010空间一致性达80.20%。两种产品对耕地、林地、人工地面一致性高,对草地、水体、灌木、湿地、未利用土地的一致性低。② 在空间不一致区域,GlobleLand30的总体分类正确率略低于CHINA-2010,但两者对不同地类的优势不同。③ 经野外实地考察验证可知,GlobleLand30的总体精度达83.33%。④GlobleLand30与CHINA-2010的空间一致性随土地覆被复杂度的增加而降低,并在高程过渡带较低。  相似文献