山东省地震声像档案建档方法初探     

康瑞清  游本跃 《地震科技情报》2000,(2):8-10

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Biogeochemical responses to the removal of maricultural structures from an eutrophic lagoon (Tapong Bay) in Taiwan     

Hung JJ  Hung CS  Su HM 《Marine environmental research》2008,65(1):1-17

The biogeochemistry of Tapong Bay, one of the major lagoons in southern Taiwan, was studied from 1999 to 2004, encompassing a period in 2003 in which aquaculture activities were terminated and the associated structures removed. Removal of the maricultural structures resulted in the reduction of the mean time for water exchange time in Tapong Bay from about 10+/-2d to 6+/-2d. The annual mean concentration of measured nutrients (DIN, DIP and DSi) also decreased significantly, likely due to improved water exchange, ceased feeding and increased biological utilization. An overall high primary production was maintained and likely to be constrained by temperature, light availability and turbidity rather than by abundant nutrients throughout the study period. The change in stoichiometric ratios among inorganic and organic nutrients (C/N, Si/N, N/P) may be attributed to the shift of plankton community between the two periods. The annual mean of Delta POC/Delta PON was 8.1, a little bit larger than that (7.3) before removal, also possibly resulting from the shift of planktonic community (from diatom-dominated to flagellate-dominated and increase of total phytoplankton and zooplankton) and removal of periphyton and oysters. The Tapong Bay shows a 37% increase (from 5.6 to 7.7 mol C m(-2)yr(-1)) in net ecosystem production (NEP) after structure removal, although the increase was not statistically significant. The change in environmental conditions has therefore influenced profoundly the carbon and nutrient biogeochemical processes and budgets in the semi-enclosed ecosystem.  相似文献   

用区域地震台网研究地球深部构造     

Benz.  HM 李于民 《地震科技情报》1994,(9):43-44

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An assessment of metal contamination in mangrove sediments and leaves from Punta Mala Bay, Pacific Panama   总被引：5，自引：0，他引：5  

Defew LH  Mair JM  Guzman HM 《Marine pollution bulletin》2005,50(5):547-552

Due to the growing rate of urbanisation in many tropical coastal areas, there continues to be an increasing concern in relation to the impact of anthropogenic activities on mangrove forests. Punta Mala Bay is located on the Pacific coast of Panama and suffers from intense anthropogenic activities that are potentially harmful to the remaining mangrove forests. Field observations reveal that the mangrove stand within Punta Mala Bay receives high inputs of untreated domestic sewage, storm water run-off and a range of diffuse inputs from shipping activities. Results from analysis of eight metals (Mn, Cu, Zn, Ni, Pb, Fe, Cr, Cd) showed that Fe, Zn and Pb were in concentrations high enough to conclude moderate to serious contamination within the bay, and thus pose the most threat to the regeneration and growth of the mangrove. However, previous biological surveys indicate ongoing mangrove regeneration and domination of stand structure by Laguncularia racemosa, together with high numbers of seedlings and saplings.  相似文献   

唐山7.8级地震前后区域应力场的动态变化特征          下载免费PDF全文

张昭栋  刘元生  韩海华  何钧  康瑞清 《地震工程学报》2001,23(2):169-171,193

利用文献[1]给出的由深井水位变化反演地壳深层应力变化的方法和华北地区井水位变化资料，反演了唐山7.8级地震前后大区域应力场的动态变化过程，分析了应力场的动态调整变化特征，结果表明，唐山地震前2年，在震中区及附近出现应力下降异常区，临震前异常幅度增大并且异常区向外围扩展，震后异常区收缩并逐渐消失。  相似文献   

Mercury levels in coral reefs along the Caribbean coast of Central America     

Guzmán HM  García EM 《Marine pollution bulletin》2002,44(12):609-1420

Sediment and coral skeleton samples from 23 coral reefs along the Caribbean coast of Costa Rica and Panama (1497 km) were evaluated for total mercury (Hg). High levels of pollution were found in the entire region with averages of 18.9 and 71.3 ppb in coral skeletons and sediments respectively. Significantly higher contamination was found in Panamanian corals (21.4 ppb) while compared to Costa Rican reef sediments (85.9 ppb). Hg from several processes and non-point sources (e.g., erosion, runoff, flooding, mining, overuse of agrochemicals, industrial waste, ports, and refineries) may have affected the entire region. The widespread observed distribution suggests that Hg is being carried along long distances within the region due to its high concentrations found in “pristine” reefs. Forest burning and colonial mining residues may be considered as possible contamination factors.  相似文献   

鲁南地震重点监视防御区地震灾害损失快速评估系统     

陈时军  何钧  胡政  康瑞清 《东北地震研究》1995,(2)

本文选择地震重点监视防御区作为试点，给出了震后灾害损失盲场快速评估的一种技术思路及其计算机软件系统。该系统在确定了地震震级、震中位置和发震时间等参数后，可快速给出整个鲁南地震重点监视防御区内地震造成的经济损失和人员作伤亡的初步预估。作为示例，文中假定该区内某地点发生了一次破坏性地震，并给出了震害的快速评估结果。  相似文献   

对地震频度的分析     

康瑞清 《高原地震》1995,(1)

对地震频度的分析一个地震专家小组和国际安全管理人员就加州兰德斯地震效应发表了尖锐的评论。指出：在下一年期间，南加州发生７．０级和７．０级以上地震的概率是４％─１２％。这项报告是由美国地质调查局、加州紧急救援办公室及加州保护委员会于１１月３０日发布的。...  相似文献   

地震水晶球证实全球大部分模糊不清     

R．A．Kerr  康瑞清译  何钧校  吕春来复校 《世界地震译丛》2012,(1):24-28

由于地震预测失败,地震学家试图进行更加模糊的预报,日本的巨大地震不过是再一次提醒这种方法存在缺陷。在3月份的毁灭性巨震给东京以北地区造成灾难时,没有人察觉这一巨大地震将要来临。"日本科学家属于世界最优秀之列,并且他们拥有最好的监测台网",加州门洛帕克美国地质调查局的地球物理学家Ross Stein说。"很难想象其他人会做出更好的预报。没有一个团体以我们都满意的方法在做"。  相似文献   

山东潍坊地区多层砖房震害预测     

何钧  康瑞清 《华北地震科学》1999,17(1):17-27

利用多层砌体房屋震害预测专家系统,对山东潍坊地区１８２栋多层砖房逐栋进行了单体房屋的震害预测,在此基础上,统计分析了该地区多层砖房的地震易损性特征,并进行了初步震害预测研究,给出了该类房屋的易损性矩阵,各破坏等级的损失参数矩阵和对应不同地震烈度的相对损失预测,为进一步开展震害预测和采取地对性的防震减灾对策提供了科学依据。  相似文献