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Ambient noise tomography of Jinan: the migration of groundwater and the formation of geothermal water
Acta Geologica Sinica-English Edition ( IF 3.3 ) Pub Date : 2021-09-20 , DOI: 10.1111/1755-6724.14808 Ting Lei 1, 2, 3 , Feng Liang 1, 2 , Chen Han 1, 2, 4 , Zhihui Wang 1, 2 , Junlun Li 3, 5 , Yan Ma 1, 2 , Huajian Yao 3, 5
Acta Geologica Sinica-English Edition ( IF 3.3 ) Pub Date : 2021-09-20 , DOI: 10.1111/1755-6724.14808 Ting Lei 1, 2, 3 , Feng Liang 1, 2 , Chen Han 1, 2, 4 , Zhihui Wang 1, 2 , Junlun Li 3, 5 , Yan Ma 1, 2 , Huajian Yao 3, 5
Affiliation
Jinan is an important city in eastern China. The groundwater in this region is rich. There are four famous springs in the urban area and there is plenty of geothermal water in the northern part, which makes the migration of groundwater in this area a very important issue. To study the shallow shear wave velocity structure and the groundwater migration in Jinan, we utilized the continuous waveform data (nearly a month) of 175 short period seismometers deployed by Chinese Academy of Geological Sciences to calculate the cross-correlation function. We picked 7749 group dispersion curves and 6117 phase dispersion curves with a period range of 0.2∼2 s. Through inversion, we got the fine three-dimensional shear wave velocity and azimuthal anisotropy structure (0∼2.4 km). Combing the results with local geological and hydrological data, we got following conclusions: (1) There are widespread high velocity anomalies in the region between Qianfoshan Fault and Wenhuaqiao Fault, and in the east of Wenhuaqiao Fault, which may be related to the intrusive gabbro (known as Jinan Intrusive Rock). (2) The two separated high velocity anomalies in our model may indicate that Jinan Intrusive Rock was broken with the movement of crust. The two parts are called west and east Jinan Intrusive Rock in this paper. (3) There is an obvious low velocity layer under the intrusive rock. This could be the channel of groundwater migration. The precipitation in the southern mountain region seeps down the ground, then it's blocked by the Jinan Intrusive Rock and can only go down to the deeper part, where the ground water is heated by the geothermal gradient. At last, the heated water arrives at the north part and forms the geothermal water. (4) The depth of the low velocity layer beneath the Jinan Intrusive Rock varied laterally, which may indicate that the depth of the groundwater migration is different beneath the west and east Jinan Intrusive Rock. (5) There is strong azimuthal anisotropy in southern Jinan, with nearly E-W fast orientation. This may be related to the tilt limestone layering structure.
更新日期：2021-09-20
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