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1.
This paper briefly summarizes the works in the processing of strong ground motion data, the factors affecting strong ground motion, the modeling of strong ground motion and the calculating of broad-band response spectrum which have been done recent years by engineering seismologists and seismologists of China. In addition, we think back to the international cooperation in strong ground motion of the recent years and make some expectations for the future. 相似文献
2.
ABSTRACTThis study analyses trends in low flows in Spain in the period 1949–2009, based on daily flow data collected at 60 gauging stations located in near-natural catchments. Two low-flow indicators were considered: (i) the seven-day annual minimum streamflow and (ii) the 10th percentile of the yearly flow duration curve. Catchments were clustered into three regions in terms of monthly mean flows. The Mann-Kendall test was used considering four periods between 1949 and 2009. A multi-temporal trend analysis was also applied to the longest series to identify wet and dry periods that could influence the results. Lastly, a field significance test provided a regional assessment of the at-site detected trends at each region. The results for each indicator reveal a clearly decreasing trend in low flows throughout the northern half of Spain that was found to be field-significant over the (Atlantic and Mediterranean) regions.
Editor Z.W. Kundzewicz; Associate editor not assigned 相似文献
3.
Based on the analyses of generation, migration and accumulation of oil and gas in the structures of Kela 1, Kela 2 and Kela 3 in Kasangtuokai anticlinal belt using a series of geological and geochemical evidence, this paper proposes that the rapid rate of hydrocarbon generation, main drain path for over-pressured fluid flow and converging conduit system are indispensable conditions for the rapid, late-stage gas accumulation in the Kelasu thrust belt in the Kuqa depression. Due to structural over-lapping and the resultant rapid burial, the maturity of the source rocks had been increased rapidly from 1.3 to 2.5% Ro within 2.3 Ma, with an average rate of Ro increase up to 0.539% Ro/Ma. The rapid matura-tion of the source rocks had provided sufficient gases for late-stage gas accumulation. The kelasu structural belt has a variety of faults, but only the fault that related with fault propagation fold and cut through the gypsiferous mudstone cap could act as the main path for overpressured fluid release and then for fast gas accumulation in low fluid potential area. All the evidence from surface structure map, seismic profile explanation, authigenic kaolinite and reservoir property demonstrates that the main drain path related with faults for overpressured fluid and the converging conduit system are the key point for the formation of the giant Kela 2 gas field. By contrast, the Kela 1 and Kela 3 structures lo-cated on both sides of Kela 2 structure, are not favourable for gas accumulation due to lacking con-verging conduit system. 相似文献
4.
Dr. Markus Båth 《Pure and Applied Geophysics》1959,43(1):108-130
Summary A review is given of the present (1959) seismological stations in Sweden, i.e. Uppsala, Kiruna, Skalstugan, and Göteborg, as well as of older stations, which are no longer in operation, i.e. Vassijaure, Abisko, and Lund, including all pertinent information. The disturbing effect of the loose ground at Lund in distinction from the four first-mentioned stations is clearly demonstrated. The very good ground at Uppsala, Kiruna, Skalstugan, and Göteborg, together with the use of modern equipment of high magnification has made these stations, especially Uppsala and Kiruna, very sensitive. This is obvious from the number of recorded earthquakes. The method of time measurements, including direct recording of time signals, is described, and means to reach a high time accuracy are outlined, including the recommendation to use quartz clocks. Long-period (0.5–2 min) disturbances on the long-period Benioff combinations were mainly due to air currents in the seismometer room and were eliminated by providing the seismometers with special covers. The method of ground amplitude determinations is outlined, especially for the Benioff instruments, and typical magnification curves are given. Comparisons of ground amplitudes from simultaneous records of BenioffE, N and WiechertE, N and of BenioffZ and GrenetZ have been made. The amplitude comparison between Benioff and Wiechert has given a new estimate of the effect of friction (especially of the recording pen against the paper) in the Wiechert apparatus.
Zusammenfassung Eine Übersicht sowohl von den gegenwärtigen (1959) seismologischen Stationen in Schweden, d.h. Uppsala, Kiruna, Skalstugan und Göteborg, als auch von früheren Stationen, die nicht mehr im Betrieb sind, d.h. Vassijaure, Abisko und Lund, wird gegeben. Die störende Wirkung des lockeren Bodens in Lund zum Unterschied gegen die vier erstgenannten Stationen wird deutlich hervorgehoben. Der sehr gute Untergrund in Uppsala, Kiruna, Skalstugan und Göteborg und die Verwendung moderner Apparate hoher Vergrösserung haben diese Stationen, besonders Uppsala und Kiruna, sehr empfindlich gemacht. Dieser Umstand geht aus der Anzahl registrierter Beben hervor. Die Methode der Zeitmessungen (direkte Registrierung der Zeitsignale einbegriffen) wird beschrieben, und Massnahmen eine hohe Zeitgenauigkeit zu erreichen werden erwähnt, die auch die Verwendung von Quarz-Uhren umfassen. Langperiodische Störungen (Perioden 0.5–2 Min) auf den langperiodischen Benioff-Registrierungen waren hauptsächlich durch Luftströmungen im Seismometerraum verursacht und wurden durch spezielle Kappen über den Seismometern eliminiert. Die Methode der Bestimmung von Boden-Amplituden wird beschrieben, hauptsächlich für die Benioff-Instrumente, und typische Vergrösserungskurven sind gegeben. Vergleichungen der Bodenamplituden von parallelen Registrierungen von BenioffE, N und WiechertE, N und von BenioffZ und GrenetZ sind ausgeführt worden. Die Amplitudenvergleichung zwischen Benioff und Wiechert hat eine neue Schätzung des Einflusses der Reibung (speziell vom Schreibfeder gegen das Papier) im Wiechert-Seismographen gegeben.相似文献
5.
In this paper,the regional geologic setting and seismic hazard of Brunei Darussalam are outlined.The earthquake monitoring system and to ability to recored,process and analyze seismic events in surrounding areas are described,and some results of epicenter determinations by the monitoring system are given(Appendices I and Ⅱ）。 相似文献
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7.
The effects of the geomagnetic storms of November 8 and 10, 2004, in variations in the strength and power spectra of the electric field in the near-Earth’s atmosphere in Kamchatka were studied, together with the meteorological and geophysical phenomena observed simultaneously. A sequence of strong solar flares was shown to cause an anomalous increase in air temperature and humidity. This resulted in the excitation of anomalously strong thunderstorm processes in the atmosphere during the storm of November 8 and made it impossible to distinguish the effects associated with cosmic rays on this background. During the storm of November 10, on the background of weak variations in meteorological parameters, an increase in the strength and intensity of power spectra of the electric field on the day before the storm of November 10 was detected; it was followed by an attenuation of these parameters on the date of the storm. These effects were supposed to be associated with the action of cosmic rays on currents of the global electric circuit. It was shown that the influence of the Forbush effect of galactic cosmic rays in the power spectrum of the electric field first of all shows as the amplification of the component with the period T ～ 48 h; in variations in humidity, the effect shows as the amplification of the component with T ～ 24 h. Cause-and-effect relationships between variations in the electric field strength and the horizontal component of the geomagnetic field were shown to be absent both under the conditions of “fair weather” and during the storm of November 10. A diurnal negative-difference atmospheric pressure was detected on the second day after the geomagnetic storms of November 8 and 10. 相似文献
8.
Indonesia is situated at the juncture of three major tectonic plates:the Eurasian,the Pacific and the Indo-Australian Plates,As a result,many parts of the country are classified as being at a high risk of earthquake and tsunami disasters.In Indonesia,the Bureau of Meteorology and Geophysics(BMG)is the agency responsible for the monitoring of tectonic earthquakes and tsunamis induced by them.For this purpose,BMG operates seismic networks throughout Indonsia.In order to serve better,BMG will have to improve its monitoring system.Many agencies and universities in Indonesia have done research in the field of seismology,including seismotectonics,earthquake hazards,and so on.Joint research has been done with agencies/universities from abroad.Considering the fact that some earthquake prone areas in Indonesia suffer from frequent disasters,a study on earthquake prediction in some areas of interest would contribute to achieving some long-term goals of the Bureau. 相似文献
9.
《地震学报(英文版)》1998,(6)
ＦｏｒｓｈｏｗｉｎｇｔｈｅｅｐｉｃｅｎｔｒａｌｄｉｓｔｒｉｂｕｔｉｏｎｉｎａｎｄｎｅａｒＣｈｉｎａａｓｗｅｌａｓａｌｏｖｅｒｔｈｅｗｏｒｌｄ，ｔｗｏｅｐｉｃｅｎｔｒａｌｍａｐｓｆｏｒｔｈｅｅａｒｔｈｑｕａｋｅｓｏｃｃｕｒｅｄｌａｓｔｙｅａｒａｒｅｐｕ... 相似文献
10.
陈培善 《地震学报(英文版)》1999,(6)
ForshowingtheepicentraldistributioninandnearChinaaswellasallovertheworld,twoepicentralmapsfortheearthquakesoccurredlastyeararepublishedannuallyinthe6-thissueeachyear.Figures1and2representtheepicentraldistributionsinandnearChinaandallovertheworldin1998,respectively.Figure1EpicentraldistributioninandnearChinain1998Figure2Epicentraldistributionallovertheworldin1998Epicentral distribution in 1998@陈培善… 相似文献
11.
In this paper,the development of the National Seismic Network of Malaysia is described firest.Then,the maximum intensities on the Modified Mercalli(MM) scale experienced by Peninsular Malaysia and East Malaysia and the damage to man-made structures caused by earthquakes are analyzed.Finally,the seismicrisk management and strategy to mitigate seismic risk in Malaysia are outlined. 相似文献
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13.
This report describes briefly the natural conditions and effect of earthquakes in Laos,Though Laos is not severely affected by earthquakes,it is doing its best to start seismological activity through the bilateral cooperation with China and with other ASEAN countries and through the framework of ASEAN-China cooperation. 相似文献
14.
陈培善 《地震学报(英文版)》1997,(6)
Ｅｐｉｃｅｎｔｒａｌｄｉｓｔｒｉｂｕｔｉｏｎｉｎ１９９６ＰＥＩ－ＳＨＡＮＣＨＥＮ（陈培善）ＩｎｓｔｉｔｕｔｅｏｆＧｅｏｐｈｙｓｉｃｓ，ＳｔａｔｅＳｅｉｓｍｏｌｏｇｉｃａｌＢｕｒｅａｕ，Ｂｅｉｊｉｎｇ１０００８１，ＣｈｉｎａＦｏｒｓｈｏｗｉｎｇｔｈｅｅ... 相似文献
15.
The Singapore seimic network and the seismicity of Singapore are briefly described,the four tremor events experienced by Singapore are discussed and the ground responses of different stations are compared,The tremor incident standing operation procedure is also prsented. 相似文献
16.
《中国地震研究》1996,(1)
Progress and application of earthquake studies are important and effective fundamentals for the improvement of earthquake prevention and disaster reduction. Through industrious effort during the past 30 years, significant advances were made in understanding the rules of earthquake occurrence, and the mastering and applying of the technology of earthquake prevention and disaster reduction. A number of devices that come close to or reach advanced world levels have been established and some systems in seismological experiments and earthquake prevention work have been improved, the ability to test and identify earthquake precursors have been raised, and the understanding of the complexity of these precursors has been deepened. The practical indexes and approaches for earthquake prediction have been worked out, and remarkable achievements in predictions and prevention of major earthquakes have been 相似文献
17.
陈培善 《地震学报(英文版)》2005,(6)
For showing the epicentral distribution in and near China as well as all over the world, two epicentral maps for the earthquakes occurred last year are published annually in the 6-th issue each year. Figures 1 and 2 represent the epicentral distributions in and near China and all over the world in 2004, respectively. Figure 1 Epicentral distribution in and near China in 2004 Figure 2 Epicentral distribution all over the world in 2004Epicentral distribution in 2004@陈培善$Institute of Geop… 相似文献
18.
陈培善 《地震学报(英文版)》2006,19(6):726-726
For showing the epicentral distribution in and near China as well as all over the world,two epicentral maps for the earthquakes occurred last year are published annually in the6-th issue each year.Figures1and2represent the epicentral distributions in and near China and all over the world in2005,respectively.Figure1Epicentral distribution in and near China in2005Figure2Epicentral distribution all over the world in2005Epicentral distribution in 2005@陈培善$Institute of Geophysics, China Eart… 相似文献
19.
陈培善 《地震学报(英文版)》1995,(4)
Ｅｐｉｃｅｎｔｒａｌ ｄｉｓｔｒｉｂｕｔｉｏｎ ｉｎ １９９４Ｐｅｉ－ＳｈａｎＣＨＥＮ（陈培善）（ＩｎｓｔｉｔｕｔｅｏｆＧｅｏｐｈｙｓｉｃｓ，ＳｔａｔｅＳｅｉｓｍｏｌｏｇｉｃａｌＢｕｒｅａｕ，Ｂｅｉｊｉｎｇ１０００８１，Ｃｈｉｎａ）Ｐｅｉ－ＳｈａｎＣ... 相似文献
20.
Some important scientific problems in current lithospheric physics research in China 总被引：3，自引：0，他引：3
China has achieved much during recent years in the area of lithospheric physics research and promoted the development of the geosciences （Teng, 2004）. However, in the 21^st century, national needs and policy challenges the science of lithospheric physics. I suggest a general analysis, research, and development direction for lithospheric physics and point out clearly the content, core problems, and key scientific problems in this field. The realization of the earth and the discovery of the basic mechanisms of mountains, basins, minerals, and natural disasters depend basically on high-resolution observations of geophysics, the delineation of the fine structure of crust and mantle （2D and 3D） inside the lithosphere, substance and energy exchanges in the deep earth, the process of deep physical, mechanical, and chemical actions, and deep dynamical response. Therefore, geophysics should be the pioneer in the geosciences field in the first half of the 21^st century. I end with an analysis and discussion of some problems and difficulties in the research of lithospheric physics. 相似文献