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Analysis on Anomaly Characteristics of Litang Hot Spring Temperature Before Major Earthquakes

Session: New Insights Into the Preparatory Phase of Earthquakes From Tectonic, Field and Lab Experiments [Poster]

Type: Poster

Date: 4/19/2021

Presentation Time: 03:45 PM Pacific

Description: 

The changes of water temperature in underground fluid may reflect the change of thermal state caused by tectonic activity during earthquake gestation. For many years in the practice of earthquake gestation, the change of water temperature anomaly is also an important index of short-term and imminent anomaly (Liu et al., 2015) This research discusses the anomalies of Litang spring temperature based on the long-term observation data and the surrounding major earthquakes within 500km.

Litang hot spring is a mixture of cold and hot water, the hot water upwelling is mainly from the deep heat source in the crust (Qiu , 2018). Before the major earthquakes, the crustal stress accumulation led to the decrease of the heat source upwelling channel in Litang hot spring and the temperature would be abnormal with a decline of more than 5℃ before these earthquakes and could last for more than 6 months. But the similar change of Litang temperature was not found before Wenchuan M8.0 earthquake. GNSS data also showed that the Longmenshan Fault and its surrounding areas were strongly coupled for a long time before the Wenchuan earthquake which led to the decrease of the hot water supply in Litang（Zhao et al., 2015; Zou et al., 2015）.

References

Liu Y W, Ren H W, Zhang L, et al. 2015, Unerground fluid anomalies and the precursor mechanisms of the Ludian M6.5 earthquake (in Chinese). Seismology And Geology, 37(1): 307-318.

Qiu G L. 2018, The research of temperature anomaly of Maoya thermal spring in Litang, Sichuan and its ability on reflecting earthquake. Advances in Geosciences, 8(7): 1195-1204.

Zhao J, Jiang Z S, Niu A F, et al. 2015, Study on dynamic characteristics of fault locking and fault slip deficit in the eastern boundary of the Sichan-Yunnan rhombic block(in Chinese). Chinese J. geophys, 58(3): 872-885.

Zou Z Y, Jiang Z S, Wu Y Q, et al. 2015, Dynamic characteristics of crustal movement in north-south seismic belt from GPS velocity field before and after the Wenchuan earthquake(in Chinese). Chinese J. geophys, 58(5):1597-1609.

Presenting Author: Lei Tian

Student Presenter: No

Authors