The new GPS data can map crustal strain rates over large areas with a useful degree of precision. Stable strain measurement results open the door for improved estimates of earthquake occurrence. The Kostrov’s formula...The new GPS data can map crustal strain rates over large areas with a useful degree of precision. Stable strain measurement results open the door for improved estimates of earthquake occurrence. The Kostrov’s formula (1974) translates the smoothed strain rates in North China into geodetic moment rates. In North China, the ratio of seismic moment released to moment accumulated from GPS measurement is 60.6% in NS direction, 68.9% in EW direction, and 104.1% in NE shear direction. The near unit ratio points to the reliability of GPS measurements there. The combination of historical seismicity and GPS measurement offers a powerful attack on earthquake hazard.展开更多
A study has been reported on <sup>208</sup>Pb/<sup>206</sup>Pb and <sup>207</sup>Pb/<sup>206</sup>Pb ratio variations in ancient drums and Cu-., Pb- ores from Guangxi, C...A study has been reported on <sup>208</sup>Pb/<sup>206</sup>Pb and <sup>207</sup>Pb/<sup>206</sup>Pb ratio variations in ancient drums and Cu-., Pb- ores from Guangxi, China and can indicate that the Cu- and Pb- bearing ores for making the Beiliu and the Lingshan type drums were taken from Tongshiling of Beiliu County and its vicinity, that were not only ancient sites for smelting the copper ores, but possibly also for casting the bronze drums. Some of the Lengshuichong type drums have abnormal Pb isotopic ratios, which means that they were made of special ore sources, one of the possibilities is that the ore material or the drums were transported from South- East Asia to Guangxi Province, because they have been excavated there too.展开更多
IntroductionAncient bronze drums are representatives of the historical culture of the minori-ty people living in southern China,such as Yunnan,Guizhou and Guangxi.About 1400 drums ranging in age from the early Spring-...IntroductionAncient bronze drums are representatives of the historical culture of the minori-ty people living in southern China,such as Yunnan,Guizhou and Guangxi.About 1400 drums ranging in age from the early Spring-Autumn Dynas-ty(700-400 B.C.)to the Ming-Qing Dynasty(1368-1828 A.D.)havebeen found in China so far(Wang,K.R.,1982).A cemetory of 79 ancient tombs with 1002 Cu-bearing wares at Wanjiaba,Chuxiong County,Yunnan Province was excavated during 1975 to 1976.The4 bronze drums unearthed from Tomb No.23,were dated at 690±90 B.C.,while one from Tomb No.1 at 400±85 B.C.by the ^(14)C method(Tong,E.展开更多
文摘The new GPS data can map crustal strain rates over large areas with a useful degree of precision. Stable strain measurement results open the door for improved estimates of earthquake occurrence. The Kostrov’s formula (1974) translates the smoothed strain rates in North China into geodetic moment rates. In North China, the ratio of seismic moment released to moment accumulated from GPS measurement is 60.6% in NS direction, 68.9% in EW direction, and 104.1% in NE shear direction. The near unit ratio points to the reliability of GPS measurements there. The combination of historical seismicity and GPS measurement offers a powerful attack on earthquake hazard.
文摘A study has been reported on <sup>208</sup>Pb/<sup>206</sup>Pb and <sup>207</sup>Pb/<sup>206</sup>Pb ratio variations in ancient drums and Cu-., Pb- ores from Guangxi, China and can indicate that the Cu- and Pb- bearing ores for making the Beiliu and the Lingshan type drums were taken from Tongshiling of Beiliu County and its vicinity, that were not only ancient sites for smelting the copper ores, but possibly also for casting the bronze drums. Some of the Lengshuichong type drums have abnormal Pb isotopic ratios, which means that they were made of special ore sources, one of the possibilities is that the ore material or the drums were transported from South- East Asia to Guangxi Province, because they have been excavated there too.
文摘IntroductionAncient bronze drums are representatives of the historical culture of the minori-ty people living in southern China,such as Yunnan,Guizhou and Guangxi.About 1400 drums ranging in age from the early Spring-Autumn Dynas-ty(700-400 B.C.)to the Ming-Qing Dynasty(1368-1828 A.D.)havebeen found in China so far(Wang,K.R.,1982).A cemetory of 79 ancient tombs with 1002 Cu-bearing wares at Wanjiaba,Chuxiong County,Yunnan Province was excavated during 1975 to 1976.The4 bronze drums unearthed from Tomb No.23,were dated at 690±90 B.C.,while one from Tomb No.1 at 400±85 B.C.by the ^(14)C method(Tong,E.
