Researches on activities of main faults in Lianyungang City
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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.-
Keywords:
- fault activities /
- detection of active fault /
- weak tectonic active zone /
- Quaternary /
- Lianyungang
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图 1 研究区大地构造位置及区域地震构造略图
a：研究区与大别造山带的位置关系, 修自参考文献[11]；b：区域地震构造略图，图中断裂依据参考文献[9-10,12-13]及最新探测成果，地震震级及震中依据参考文献[14-15]及中国地震台网正式目录（至2023年12月），盆地边界修自参考文献[16]；断裂名称：①郯庐断裂带，②渤海-威海断裂带，③淮阴-响水断裂，④邵店-桑墟断裂（烧香河断裂），⑤海泗断裂带，⑥牟平-即墨断裂带，⑦北沟-玲珑断裂，⑧沧口断裂，⑨海阳断裂，⑩千里岩断裂。
Figure 1. Sketch map of tectonic setting and regional seismotectonics of the study area
a: The relationship between the study area and the Dabie Orogenic Belt, modified after [11]; b: Regional seismotectonic map. The faults in the figure are based on references [9-10,12-13] and the latest detection results. The earthquake magnitude and epicenter are based on references [14-15] and the official catalogue of China Seismic Network (As of 2023 December). The basin boundary is compiled after [16]. Faults numbers: ① Tanlu Fault Zone, ② Bohai Sea-Weihai Fault Zone, ③ Huaiin-Xiangshui Fault, ④ Shaodian-Sangxu fault (Shaoxiang River Fault), ⑤ Hesi Fault Zone, ⑥ Mouping-Jimo Fault Zone, ⑦ Beigou-Linglong Fault, ⑧ Cangkou Fault, ⑨ Haiyang Fault, ⑩ Qianliyan Fault.
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图 2 研究区主要断层分布图
F1：海州-韩山断裂, F2：猴嘴-南城断裂, F3：烧香河断裂, F4：伊芦山北断裂, F5：排淡河断裂, F6：猴嘴-一沟断裂, F7：玉带河断裂, F8：南城-新浦断裂, F9：海州-韩山支断裂。
Figure 2. Distribution of main faults of the study area
F1: Haizhou-Hanshan Fault, F2: Houzui-Nancheng Fault, F3: Shaoxiang River Fault, F4: North Yilu Mountain Fault, F5: Paidan River Fault, F6: Houzui-Yigou Fault, F7: Yudai River Fault, F8: Nancheng-Xinpu Fault, F9: Haizhou-Hanshan Branch Fault.
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图 3 连云港地区云台山南北两侧钻孔第四系地层对比剖面图
Figure 3. Inter-well litho-stratigraphic correlation among boreholes in north and south foothill sides of Yuntai Mountain in Liangyugang City
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图 4 测线LBK2a浅层地震反射剖面
Figure 4. Time profile of the shallow seismic reflection along line LBK2a
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图 5 测线LBK2b折射层析成像速度剖面
Figure 5. Velocity profile of the refraction tomography along line LBK2b
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图 6 刘滩村北跨海州-韩山断裂新沭河大堤 PZ10 钻孔联合地质剖面图
Figure 6. PZ10 comprehensive borehole geological sections across the Haizhou-hanshan Fault along the New Shuhe River dam to the north of Liutan Village
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图 7 测线10-1断点F3-1局部时间剖面（a）及其地质解释剖面（b）
Figure 7. Time section across fault point F3-1 (a) and its geologic interpretation (b) along line 10-1
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图 8 山南管理区北跨烧香河断裂PZ4钻孔联合地质剖面图
Figure 8. PZ4 comprehensive borehole geological section across the Shaoxianghe Fault to the north of the Shannan Management District
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图 9 测线LBK8a时间剖面（a）及其地质解释剖面（b）
Figure 9. Time section across fault point F8-3 (a) and its geologic interpretation (b) along line LBK8a
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图 10 跨南城-新浦断裂PZ8钻孔联合地质剖面图
Figure 10. PZ8 comprehensive borehole geological section across the Nancheng-Xinpu Fault near the Punan Town
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图 11 九岭村北基岩内北西向断裂剖面
①石英云母片岩；②云母片岩节理劈理带；③碎裂岩，含断层角砾；④片岩碎粉岩，宽约20 cm；⑤已固结浅灰绿色断层泥，厚3～5 cm。
Figure 11. Sketch section of an NW-trending fault to the north of the Jiuling Village
① Quartz-mica schist; ② Mica schist joint and cleavage belts; ③ Cataclasite, contains fault breccia; ④ Ultracataclasite of schist, about 20 centimeters wide; ⑤ Consolidated light gray-green fault gouge, 3-5 centimeters thick.
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