日本海—鄂霍次克海深震带地震活动与中国大陆地震的关系

日本海－鄂霍次克海深震带地震活动与中国大陆地震有一定的相关性，尤其是其地震迁移规律与中国大陆展布方向相同的地震带的迁移规律一致，因此，所得结果不仅对预测中国大陆地震大形势有意义，而且也找到了两者力学上的联系。     

青藏地震区地震的迁移

本文研究了青藏地震区地震的迁移，发现Ｍｓ≥６．７地震有自西向东的定向迁移规律，该现象有助于研究中国大陆西部地区所受作用力的方向和预测地震的可能发生地区。     

东南沿海地震带地震序列特征与迁移规律

研究了中国大陆东南沿海地震带地震的迁移规律和序列特征，以及与台湾地区Ｍｓ≥７．０级地震的关系。所得结果对该带的地震趋势估计有一定的参考意义。     

中国大陆东南沿海地震带地震迁移规律

用一种新思路、新方法研究了中国大陆东南沿海地震带地震的迁移，结果表明其具有由东向西定向迁移的规律，其各个迁移过程的迁移速度也相对稳定，平均值为４２ｋｍ／ａ，这为该带地震活动的动力源和目前可能的地震危险区提供了一定的依据。     

兴都库什—贝加尔地震带的地震迁移

应用一种新思路、新方法研究兴都库什－贝加尔地震带内的地震迁移，结果表明，地震沿地震带由南西西向北东东方向定向迁移，平均迁移速度为每年１２９ＫＭ量级与中国大陆西部地震带（区）的地震迁移速度相当，研究结果为地震动力学和地震预报提供了一定的依据。     

兴都库什－贝加尔地震带的地震迁移

应用一种新思路、新方法研究兴都库什－贝加尔地震带内的地震迁移，结果表明，地震沿地震带由南西西向北东东方向定向迁移，平均迁移速度为每年１２９ｋｍ，量级与中国大陆西部地震带（区）的地震迁移速度相当．研究结果为地震动力学和地震预报提供了一定的依据．     

昆仑山口西8.1级地震后地震趋势分析

从地震活动周期对比、中国大陆周边边界动力条件变化以及西部地区强震迁移规律等方面，分析了昆仑山口西8．1级地震后中国大陆地震活动趋势，并统计分析了大陆西部7．5级以上强震对东部地区地震活动的影咱．结果显示，8．1级大震后中国大陆1900年以来的第五个地震活跃期已趋于结束，但地震频次、释放能量尚不够，大陆边界动力条件没有改变．因此今后几年大陆内部仍存在发生7级或稍强地震的可能，其中西部的西北区发震可能性相对较大；影咱东部地区地震活动的强度可能为6．5级左右。     

板块地震迁移链与汶川地震

从1956年开始沿印度洋—亚洲和太平洋板块边界的地震迁移触发了2008年5月12日M8.0中国汶川地震。迁移链为东西两条,彼此相向迁移,在缅甸弧附近的中国大陆汇合,并触发地震。迁移持续约50年。与此相类似的迁移发生在1902—1957年,迁移触发了1950年西藏东部M8.5地震和1957年蒙古M8.3地震。预计1956—2008地震迁移可能尚未结束,可能会继续触发大地震。     

欧亚地震带地震活动和中国大陆地震

欧亚地震带及其与中国大陆相邻地域的地震活动和中国大陆地震之间存在有多种相关关系，这些相关关系对预测中国大陆地震活动趋势有一定的作用     

试论小区地震活动的时间规律

为了探讨小区域内地震活动的时间规律。本文在中国大陆选择了11个地点分析其从远古至公元1990年间的破坏性地震（M≥4 3／4）的活动性。因而发现小区的地震活动规律主要表现于以大震为代表的地震活动分期上，破坏性地震的频率、集中程度与阶段性变化上，以及与所在地震区地震活动期的关系上，不同小区的地震活动特征有共性，有类型区别，更有各自的特殊性。     

2002年7月23日南黄海4.9级地震概述

概述了2002年7月23日南黄海Ms4.9地震的地震参数、地震影响、地震应急、地震预测，以及震源区地质构造及历史地震等情况。     

Verification of Parameters of Major Historical Earthquakes in the North Yellow Sea

Based on existing historical data and observations from the Dalian seismic station,this paper rechecks the parameters of the three historical earthquakes of 1916,1917 and 1944 in the North Yellow Sea,near the Yalu River region.The results show that their relocated epicenters are located at contemporarily intense seismic active zones,consistent with the results derived from the data of the Dalian seismic station.The results are valuable in both revising earthquake catalogues and understanding the local background seismicity.     

Onshore tsunami deposits caused by the 1993 Southwest Hokkaido and 1983 Japan Sea earthquakes

Onshore tsunami deposits resulting from the 1993 Southwest Hokkaido and 1983 Japan Sea earthquakes were described to evaluate the feasibility of tsunami deposits for inferring paleoseismic events along submarine faults. Tsunami deposits were divided into three types, based on their composition and aerial distribution: (A) deposits consisting only of floating materials, (B) locally distributed siliclastic deposits, and (C) widespread siliclastic deposits. The most widely distributed tsunami deposits consist of the first two types. Type C deposits are mostly limited to areas where the higher tsunami runup was observed. The scale of tsunami represented by vertical tsunami runup is an important factor controlling the volume of tsunami deposits. The thickest deposits, about 10 cm, occur behind coastal dunes. To produce thick siliclastic tsunami deposits, a suitable source area, such as sand bar or dune, must be available in addition to sufficient vertical tsunami runup. Estimation of the amounts of erosion and deposition indicates that tsunami deposits were derived from both onshore and shoreface regions. The composition and grain size of the tsunami deposits strongly reflect the nature of the sedimentary materials of their source area. Sedimentary structures of the tsunami deposits suggest both low and high flow régimes. Consequently, it seems very difficult to identify tsunami deposits based only on grain size distribution or sedimentary structure of a single site in ancient successions.     

1518年6月22日韩国首尔以西海域——南黄海大震

1518年6月22日韩国首尔以西海域——南黄海发生大震。地震波及朝鲜半岛全境,并在韩国首尔等沿海地区造成破坏,首尔的烈度为Ⅷ度,余震持续一个多月。地震还影响到中国东部地区。震级定为M7?级。此次地震可能与朝鲜半岛西缘断裂带（南黄海东缘断裂带）的活动有关。震中定于该断裂带附近（36.5°N,125.2°E）。     

1992年黄海5.3级地震

对黄海5.3级地震序列研究表明,该序列属于一个典型的主-余震型地震。震源机制解的结果表明,该区主压应力方向基本上和华北地区主压应力方向一致。通过对5.3级地震前区域地震活动分析结果说明,该地震是在区域地震活动中期异常背景的情况下发生的,即存在明显的地震活动增强和孕育空区。     

北黄海重要历史地震参数复核

以文献记载资料和大连地震台的观测资料为主要依据,对1916年、1917年和1944年发生在北黄海鸭绿江口附近的3次重要地震参数进行复核确认,复核后的震中位于现代小地震活动相对密集的地段,且与大连台的观测结果更吻合.本文结果为合理识别发震构造和修订地震目录准备了条件.     

The Large Earthquake Offshore West of Seoul, Korea, in the Southern Yellow Sea on June 22, 1518

On June 22,1518,a large earthquake,measuring M7~(1/2),occurred offshore west of Seoul,Korea in the southern Yellow Sea. This earthquake affected the whole Korean Peninsula,and caused damage to the coastal areas such as Seoul,where the seismic intensity was degree Ⅷ. Aftershock activity lasted for more than one month. The earthquake also affected the Eastern China region. This earthquake was possibly related to the activity of the western margin fault zone of the Korean Peninsula( the eastern margin fault zone of the southern Yellow Sea). The epicenter of the earthquake was located 36. 5°N and 125. 2°E.     

A seismic gap in the eastern margin of the Sea of Japan as inferred from the time-space distribution of past seismicity

Abstract Based on the spatial distribution of the focal areas from previous large earthquakes, a significant seismic gap was found off the coast of the Akita Prefecture at the eastern margin of the Sea of Japan. We forecast that the 75 km segment of plate boundary may be ruptured by a large thrust earthquake with a magnitude of 7.5 in the near future. The time of occurrence is uncertain, but the recurrence interval of large earthquakes in this region suggests that it will be no later than the end of next century. The time sequence of large earthquakes in the eastern margin of the Sea of Japan shows a systematic shortening of the earthquake interval for the past 250 years. This feature is simulated successfully by a simple mechanical model that represents a plate boundary by segmented blocks, each of which is composed of a spring friction slider system. We further propose to revise the conventionally accepted plate boundary between the Eurasian and Okhotsk plates in the eastern margin of the Sea of Japan; the observed data of seismic activity and recent crustal deformation indicate that the southern part of the plate boundary traverses the land region from Niigata to Otari along the Shinanogawa seismic belt. The fault geometries of previous large earthquakes show that the mode of plate convergence in the eastern margin of the Sea of Japan is a collision type rather than a simple eastward subduction as was postulated in early studies.     

Distribution of Cs and Pu in the surface waters of the East Sea (Sea of Japan)

Surface and subsurface water samples for ¹³⁷Cs and ^239,240Pu analysis were collected in the East Sea (Sea of Japan) during August 1993. The ¹³⁷Cs levels of the surface waters are quite homogeneous in the East Sea (average = 3.1±0.2 mBq kg⁻¹). The ^239,240Pu levels vary from 6 to 10 μBq kg⁻¹ in the surface. ^239,240Pu to ¹³⁷Cs ratios in the surface water are within 0.002 to 0.003. The East Sea may be regarded as a part of the North Pacific Ocean in terms of ¹³⁷Cs dispersal in the surface, where the ¹³⁷Cs contents of the surface seawater seem to be controlled primarily by the atmospheric input. However, since our sampling was made just two months prior to the widely publicized Russian dumping incident on the 17th October 1993, our measurements may provide background data to assess the immediate impact of the Russian dumping on the levels of ¹³⁷Cs and ^239,240Pu in the East Sea.     

1984-5-21南黄海M6.2级地震系列的震源电磁辐射临震前兆之记录图像及其分析

本文提供了1984年5月21日前后,南黄海M6．2及M6．1双主震及其前震、余震、邻震系列的“震源超极低频（0．3-3Hz）电磁辐射前兆”系列记录图（共11次地震的前兆）,并着重指出前兆记录中与地震三要素的预报直接相关的各种信息参数及其规律。