Historical earthquake activity of the northern part of the Dead Sea Fault Zone, southern Turkey

The northern part of the Dead Sea Fault Zone is one of the major active neotectonic structures of Turkey. The main trace of the fault zone (called Hacıpaşa fault) is mapped in detail in Turkey on the basis of morphological and geological evidence such as offset creeks, fault surfaces, shutter ridges and linear escarpments. Three trenches were opened on the investigated part of the fault zone. Trench studies provided evidence for 3 historical earthquakes and comparing trench data with historical earthquake records showed that these earthquakes occurred in 859 AD, 1408 and 1872. Field evidence, palaeoseismological studies and historical earthquake records indicate that the Hacıpaşa fault takes the significant amount of slip in the northern part of the Dead Sea Fault Zone in Turkey. On the basis of palaeoseismological evidence, it is suggested that the recurrence interval for surface faulting event is 506 ± 42 years on the Hacıpaşa fault.     

永登5.8级地震序列及有关问题讨论

对永登５．８ 级地震序列及近１０ 年来永登—兰州地区的小震活动进行了研究,结果表明：永登５．８ 级地震为孤立型,震前近１０ 年震区一直有小震活动,主震是在小震活动经历了一个增多—加剧—平静的过程后才发生的。历史地震活动资料及地质构造表明,永登地区存在中强地震孕育的背景     

河北磁县北西西向南山村－岔口活动断裂带活动特征与1830年磁县地震

河北磁县西部北西西向南山村－岔口活动断裂为北西西向磁县活动断裂西段，全长３５ｋｍ，又可再分为东西两段。全新世时期该断裂有多次活动，活动方式以具左旋性质的正倾滑为主。１８３０年磁县７．５级地震时，南山村－岔口断裂带出现新的地表破裂，地表垂直位移多处为２～４ｍ，最大约７ｍ。据目前资料，该断裂带最新两次地震事件的时间间隔约为３５００ａ。最近获取的位于磁县最高峰老爷山庙宇碑文资料，补充说明了邻近岔口活动断裂带的古建筑物在１８３０年地震中的严重破坏     

西昌市大箐梁子一带古地震初探

大箐梁子一带有着众多明显的古地震遗迹。它们的相互叠加和重复，说明该地是一个曾多次发生强震的震中区。从古地震遗迹的初步研究可知，目前地处大箐梁子北侧一带的活动断层侵蚀作用十分活跃，造成了邛海水系袭夺则木河上游水系，并迫使分水岭不断南移。     

Historical changes in heavy metals in the Yangtze Estuary, China

A 6-m-long core was used to examine historical changes in heavy metals on tidal flats in the Yangtze Estuary, China. Over the last 100 years, human impact was minimal. However, over the last few decades, vertical metal concentrations have been affected by human activities such as local industrialization, urbanization and construction of major sewage outlets. Copper, lead and arsenic were identified as contaminants in the Yangtze Estuary on the basis of national pollution standards and a comparison of metals in the upper core with those in the lower core.     

山西应县木塔与历史地震

山西应县木塔与历史地震的关系是制定修缮应县木塔方案中的一个重要的问题。通过对历史资料的详细研究，对应县木塔的建造时间、场地影响烈度、地震对木塔的影响以及历史上2次加固的情况有了更清晰的认识。在此基础上，对未来的地震烈度给出了最保守的估计，并结合木塔的场地条件和木塔的结构，提出了对应县木塔抗震加固的具体建议。