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摘要:
采用地质地貌调查、高精度浅层地震反射波法及折射波法探测、跨断层钻孔联合地质剖面探测和年代测试等多种方法对连云港市主要断层开展了探测工作。利用高质量的第一手资料，对海州-韩山断裂（F1）等3条代表性断裂的第四纪活动性进行了综合研究。结果表明北北东向海州-韩山断裂（F1）和北东向烧香河断裂（F3）是早第四纪断裂，而北西向南城-新浦断裂（F8）是前第四纪断裂。连云港地区和山东半岛具有类似的地震构造背景，属于中国东部第四纪构造弱活动区，第四纪断裂活动较弱，地震活动水平也低，区内历史破坏性地震记录仅有一次1495年的连云港海州4¾级地震。6级及以上地震活动主要集中于区内西侧北北东向郯庐断裂带和东侧南黄海盆地。按照构造类比原则，区内具有发生5级左右地震的可能。值得注意的是，来自外围的郯庐断裂带及南黄海盆地的强震对于区内影响大于本地地震，特别是1668年郯城8½级地震对研究区地震烈度影响达Ⅷ度。因此，在连云港市防震减灾工作中应综合考虑本地5级左右地震以及外围强震影响。
Abstract:Geological and geomorphological survey, high accuracy shallow seismic P-wave reflection and refraction exploration and S-wave exploration, borehole joint geological section drilling across fault, and age dating technologies were applied for the surveying on active fault in Lianyungang City, Jiangsu, East China. Nine main faults were prospected. The Quaternary activities of three typical faults including the Haizhou-hanshan Fault (F1) were studied with the first hand documents in high quality obtained in this project. Results show that the NNE-trending F1 and the NE-trending Shaoxianghe Fault (F3) are probably the early Quaternary faults, while the NW-trending Nancheng-xinpu Fault (F8) and other main faults are all pre-Quaternary faults. Lianyungang City situates on the Quaternary weakly active tectonic zone in the eastern part of China, and it shares similar seismo-tectonic background with the Shandong Peninsula to the north. Both the Quaternary fault activity and the seismicity are weak. In history, only one destructive earthquake was recorded in the city area, i.e. the
1495 Haizhou M4¾ earthquake. Epicenters of earthquakes with magnitude ≥6 concentrated in peripheral regions, namely, along the NNE-trending Tanlu Fault Zone, the NW-trending Bohai-Weihai Fault Zone, and in the northern depression and the southern depression of the south Yellow Sea. The potential earthquake outbreaks with M5±0.5 in future in Lianyungang City are possible judging from the structural analogy principle. However, the influences of strong earthquakes on the study area from adjacent Tanlu Fault Zone and the northern or southern depression of the south Yellow Sea could overtake the local geological forces thus cannot be neglected. For example, the1668 Tancheng M8½ earthquake at the Tanlu Fault Zone reached Intensity Ⅷ in the Lianyungang area. Thus, risks of both local earthquakes with M5±0.5 and strong earthquakes from surrounding areas should be considered with great concern with effective prevention and disaster reduction measurement of Lianyungang City.-
Key words:
- fault activities /
- detection of active fault /
- weak tectonic active zone /
- Quaternary /
- Lianyungang
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