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1.
This paper mainly observed and analyzed the character of shear-wave splitting in rock specimens while they were in the critical state of rupture. The rock specimens for study are made of Laizhou marble from Shandong, China. A series of records were obtained from two rock specimens when they were in the critical state of rupture. The result shows that, in the critical state just before rock rupture, there may be the phenomenon of rise and fall in the time delay of shear-wave splitting, even though the load was kept constant. That is to say, the time delay of shear-wave splitting may have a falling process before rock rupture. 相似文献
2.
WangCaifu HaoHongjian ChenXiuru 《应用地球物理》2003,6(1):78-82
The deep information of the Turfan sag was extracted and analyzed through the re-processing of the magneto-gravitational data of the Turfan sag in the Turfan-Hami basin. It is considered that the basement faults have played an important role in the controlling of the framework, lithology and the distribution of volcanic rocks in the basement of the Turfan sag. The deep crystalline basement and the upper Hercynian folded basement were studied part by part in the sag through the combined data of aeromagnetic and electric methods. It is revealed that the Huoyanshan fault is steep in the upper and lower parts but gentle in the middle, displaying a “S” type texture, and discovered that there are at least a row of local structures in the down-thrown block of the Huoyanshan fault, through the CEMP prospecting in Huoyanshan. The result is very important for the studying of the Turfan sag as a whole. 相似文献
3.
1 SURVEY OF GLOBAL SEISMICITY IN 2006
A total of 15 strong earthquakes with Ms ≥ 7.0 occurred in the world according to the Chinese Seismic Station Network in 2006 （Table 1 ）. The strongest earthquakes were the Kamchatka earthquake with Ms8.0 on March 29 and the Kuril Islands earthquake with Ms8.0 on November 15 （Fig. 1）. The frequency was slightly lower, and the energy release of earthquakes reduced in 2006 compared with the seismicity in 2005. The seismicity last year had the following characteristics： 相似文献
4.
Zhang Langping 《中国地震研究》2007,21(2):147-155
The variation of Load/Unload Response Ratio (LURR) against time for earthquakes in Kerman Province, Iran, on February 22, 2005, M6.4 and in Lorestan Province, Iran, on March 31, 2006, M6.1, has been calculated and analysed in this paper. The tempo-spatial scanning of LURR in the region of Iran during January 1, 2003 to March 31, 2006 has been conducted, with 1 year as a time-window, 1 month as a time-step, and the comparison of the LURR anomalous regions in 2004 with the actual earthquakes with M≥5.0 in the next year (2005) is also given, which shows that 11 earthquakes with M≥5.0 occurred in LURR anomalous regions while 12 earthquakes with M≥5.0 in LURR regions in 2005. Furthermore, the seismicity in this region is studied by investigating the evolvement of the anomalous LURR regions. 相似文献
5.
《中国地震研究》1995,(2)
A total of 48 earthquakes with M_s ≥5.0 occurred in China in 1994 (29 on the Chinese mainland and offshore, 19 in Taiwan). Among them 9 earthquakes were of M_s ≥6.0 (4 on the mainland and offshore, 5 in Taiwan). The M_s 7.3 earthquake that occurred in Taiwan Straits on September 16 was the greatest one offshore, which was generally included in the mainland area according to the previous statistics. The most powerful earthquakes in Taiwan were the 2 with M_s =7.0 that occurred on May 相似文献
6.
The depth of Moho in the mainland of China 总被引：1，自引：0，他引：1
ＴｈｅｄｅｐｔｈｏｆＭｏｈｏｉｎｔｈｅｍａｉｎｌａｎｄｏｆＣｈｉｎａＲｏｎｇ－ＳｈｅｎｇＺＥＮＧ；（曾融生）Ｗｅｉ－ＧｕｏＳＵＮ；（孙为国）Ｔｏｎｇ－ＥｎＭＡＯ（毛桐恩）ＺｈｏｎｇＹａｎｇＬＩＮ；（林中洋）Ｈｏｎｇ－ＸｉａｎｇＨＵ；（胡鸿翔）ａｎｄＧ... 相似文献
7.
The modeling results are presented on the annual dynamics of seismicity in the northeastern segment of the Amur plate, which are obtained from statistical studies of the number of earthquakes with magnitudes 2 ≤ М ≤ 6 in different phases of variations in the Earth’s rotation rate. We have calculated a degree of relationship between the observed seismicity variations and phases of decrease and increase in the Earth’s rotation rate for the magnitude ranges between 2 ≤ М < 4 and 4 ≤ М < 5 using rank correlation methods. It has been established that epicenters of earthquakes with magnitudes 5 ≤ М ≤ 6 are spatially grouped into a sequence of homogeneous equally spaced, 3.5°–4°, on average, east-westerly oriented clusters. 相似文献
8.
陈培善 《地震学报(英文版)》2004,(6)
For showing the epicentral distribution in and near China as well as all over the world, twoepicentral maps for the earthquakes occurred last year are published annually in the 6-th issue eachyear. Figures 1 and 2 represent the epicentral distributions in and near China and all over the worldin 2003, respectively.Maps of epicentral distribution in 2003@陈培善$Institute of Geophysics, China Earthquake Administration, Beijing 100081, China… 相似文献
9.
《中国地震研究》1998,(2)
Ⅰ. SURVEY OF GLOBAL SEISMICITY A total of 23 earthquakes with M_s ≥ 7.0 occurred over the world in 1997 according to the determination of the Chinese Seismic Station Network. The strongest one was the Kamchatka peninsula earthquake (M_s 7.9, December 5, 1997) (Fig. 1). Although the frequency and strength of global seismicity was lower compared with the higher activity state in 1995 and 1996, the frequency of seismicity was still obviously higher than the average level during this century. 相似文献
10.
LiGang LiuJie YuSurong QinDongling 《中国地震研究》2004,18(1):97-104
In 2003, a total of 20 strong earthquakes with Ms7.0 occurred in the world as determined by the Chinese Seismic Station Network (Table 1). The strongest one was the Hokkaido earthquake with Ms=8.0 on September 26 (Fig. 1). When compared with 2002, the frequency and energy release of earthquakes in 2003 increased obviously. The characteristics of activity of global earthquakes with Ms7.0 will be discussed here. 相似文献
11.
《地震学报(英文版)》1994,(4)
Ｍａｐｓｏｆｅｐｉｃｅｎｔｒｅｄｉｓｔｒｉｂｕｔｉｏｎｉｎ１９９３￥／／ＦｏｒｔｈｅｃｏｎｖｅｎｉｅｎｃｅｏｆｋｎｏｗｉｎｇｔｈｅｄｉｓｔｒｉｂｕｔｉｏｎｏｆｅｐｉｃｅｎｔｅｒｓｉｎａｎｄｎｅａｒＣｈｉｎａａｓｗｅｌｌａｓａｌｌｏｖｅｒｔｈｅｗｏｒｌ... 相似文献
12.
《中国地震研究》2007,(1)
1 SURVEY OF GLOBAL SEISMICITY IN 2006A total of 15 strong earthquakes with M_S≥7.0 occurred in the world according to the Chinese Seismic Station Network in 2006 (Table 1). The strongest earthquakes were the Kamchatka earthquake with M_S8.0 on March 29 and the Kuril Islands earthquake with M_S8.0 on November 15 (Fig.1). 相似文献
13.
《中国科学D辑(英文版)》2006,(Z2)
We measured soil, stem and branch respiration of trees and shrubs, foliage photosynthesis and respiration in ecosystem of the needle and broad-leaved Korean pine forest in Changbai Mountain by LI-6400 CO2 analysis system. Measurement of forest microclimate was conducted simultaneously and a model was found for the relationship of soil, stem, leaf and climate factors. CO2 flux of different components in ecosystem of the broad-leaved Korean pine forest was estimated based on vegetation characteristics. The net ecosystem exchange was measured by eddy covariance technique. And we studied the effect of temperature and photosynthetic active radiation on ecosystem CO2 flux. Through analysis we found that the net ecosystem exchange was affected mainly by soil respiration and leaf photosynthesis. Annual net ecosystem exchange ranged from a minimum of about -4.671μmol·m-2·s-1 to a maximum of 13.80μmol·m-2·s-1, mean net ecosystem exchange of CO2 flux was -2.0μmol·m-2·s-1 and 3.9μmol·m-2·s-1 in winter and summer respectively (mean value during 24 h). Primary productivity of tree, shrub and herbage contributed about 89.7%, 3.5% and 6.8% to the gross primary productivity of the broad-leaved Korean pine forest respectively. Soil respiration contributed about 69.7% CO2 to the broad-leaved Korean pine forest ecosystem, comprising about 15.2% from tree leaves and 15.1% from branches. The net ecosystem exchange in growing season and non-growing season contributed 56.8% and 43.2% to the annual CO2 efflux respectively. The ratio of autotrophic respiration to gross primary productivity (Ra:GPP) was 0.52 (NPP:GPP=0.48). Annual carbon accumulation underground accounted for 52% of the gross primary productivity, and soil respiration contributed 60% to gross primary productivity. The NPP of the needle and broad-leaved Korean pine forest was 769.3 gC·m-2·a-1. The net ecosystem exchange of this forest ecosystem (NEE) was 229.51 gC·m-2·a-1. The NEE of this forest ecosystem acquired by eddy covariance technique was lower than chamber estimates by 19.8%. 相似文献
14.
ＡｔｔｅｎｕａｔｉｏｎｏｆｓｔｒｅｓｓｗａｖｅｉｎｓａｎｄｓｔｏｎｅＤａｏ－ＹｉｎｇＸＩ；Ｙｏｎｇ－ＬａｉＺＨＥＮＧａｎｄＴａｏＺＨＡＮＧ（席道瑛，郑永来，张涛）（ＤｅｐａｒｔｍｅｎｔｏｆＥａｒｔｈａｎｄＳｐａｃｅＳｃｉｅｎｃｅｓ，Ｕｎｉｖｅｒｓｉｔ... 相似文献
15.
《中国地震研究》1999,(1)
I. SURVEY OF GLOBAL SEISMICITY IN 1998 A total of 17 earthquakes with M_s≥7.0 occurred in the world in 1998 according to the determination by the Chinese Seismic Station Network. The strongest earthquake occurred in Sulawesi, Indonesia (M_s7.8, November 5, 1998). The next strongest earthquake was the South Pacific Ocean earthquake (M_s7.7, March 25, 1998) and the Ryukyu earthquake (M_s7.7, May 4) (Fig. 1). 相似文献
16.
Application of WebGIS in seismological study 总被引：1，自引：0，他引：1
Introduction Earthquake is a destructive natural disaster. Earthquake studies are very complex, which not only involves space and time of large size, but also requires vast amount of spatially referenced data, such as historical records, modern instrument data, scientific experiment data and a lot of other data coming from related subjects. GIS, as an integrating tool processing multi-source data, has become a key technology in earthquake studies. In recent years, many GIS application system… 相似文献
17.
LiGang LiuJie YuSurong 《中国地震研究》2005,19(1):97-106
1 SURVEYOFGLOBESEISMICITYIN 2 0 0 4Atotalof 1 9strongearthquakeswithMS≥ 7 0occurredintheworldaccordingtotheChineseSeismicStationNetworkin 2 0 0 4 (Table 1 ) .ThestrongestearthquakewastheSumatraearthquakewithMS8 7nearthenorthwestcoastofSumatraonDecember 2… 相似文献
18.
1SURVEY OF GLOBAL SEISMICITYIN2005In2005,atotal of16strongearthquakes recordingMS≥7.0occurredinthe world,accordingtothe Chinese Seismic Station Network(Table1).The strongest earthquake registeringMS8.5strucknear the northwest coast of Sumatra on March29,2005(Fig.1).In2005,the frequency and energyrelease of earthquakes were reduced compared to a year earlier.The characteristics of the seismicityare as follows:Fig.1The distribution of global earthquakes registeringMS≥7.0during… 相似文献
19.
20.
《中国地震研究》1997,(2)
Ⅰ. SURVEY OF THE GLOBAL SEISMICITY A total of 28 earthquakes of M_s ≥7.0 occurred over the entire world in 1996 according to the determination by the Chinese Seismic Station Network. The strongest one is the Irian earthquake (M_s 7.9, February 17, 1996, Indonesia) (Fig. 1). It is considered that the global seismicity in 1996 is still situated in the active period based on the comprehensive analysis of its frequency, magnitude, and range. 相似文献