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On 8 August 2017, a Ms7.0 earthquake occurred in Jiuzhaigou in the Sichuan Province of China. In this study, we obtained the vertical continuous data recorded at 12 nearby broadband seismometers from April to December 2017, in order to characterize the temporal and spatial variations in the vertical ground motion prior to the onset of the earthquake. Using the self-mutual information method, we determined that from July to August 2017, the self-mutual information value of the vertical ground motion increased at several stations. The spatiotemporal evolution also shows that the region of highest value migrates from south to north toward the earthquake epicenter. Among them, the change of SPA (the station closest to the epicenter) is the most prominent. We believe that this phenomenon is related to the formation of the Jiuzhaigou earthquake. Our work, in combination with other published works, indicates that the Jiuzhaigou earthquake was caused by the continued eastward movement and obstruction of the Qinghai Tibet Plateau by the Sichuan Basin, and the movement of Longmenshan fault is also one of the causes of the earthquake. [ABSTRACT FROM AUTHOR]

[Objectives] To determine the water content, total ash content and acid-insoluble ash content of Yi medicinal material "Qibujing", so as to provide experimental basis for establishing the Quality Standard(Draft) of Yi Medicinal Material "Qibujing" in Sichuan Province. [Methods] According to the second method(drying method) in 0832 water content determination method and 2301 ash content determination method in Chinese Pharmacopoeia(2015 Edition), it was determined, respectively, and the data were processed by IBM SPSS Statistics 26 and DPS 7.05 data processing system. [Results] All the 14 batches of sample met the stipulation that the water content should not exceed 12.0%, the total ash content should not exceed 8.0%, and the acid-insoluble ash content should not exceed 1.5% under "Guan Zhong-(Qibujing)" in the 2005 edition of Yunnan Traditional Chinese Medicine Standard. There was a negative correlation between water content, acid-insoluble ash content and altitude, and a positive correlation between total ash content and altitude. [Conclusions] It is suggested that Quality Standard(Draft) of Yi Medicinal Material "Qibujing" in Sichuan Province stipulate that the water content should not exceed 12.0%, the total ash content should not exceed 8.0%, and the acid-insoluble ash content should not exceed 1.5%. [ABSTRACT FROM AUTHOR]

Background: The new tender leaf of Acanthopanax giraldii Harms, A. leucorrhizus (Oliv.) Harms var. fulvescens Harms & Rehd, and A. setchuenensis Harms ex Diels are collected as "Wu-Jia Vegetables" in every spring. Objective: To distinguish the 3 species of "Wu-Jia Vegetables" collected from the Aba and Ganzi Autonomous Prefectures in Sichuan province of China and ensure their safety and efficacy. Materials and Methods: The 3 species of "Wu-Jia Vegetables" were collected during flowering and fruiting in high mountain boscage slopes about 3100 meters above sea level from Qinghai-Tibet plateau, China (SWUN). (Table1). Fresh materials were fixed in FAA. Samples were passed through the traditional ethanol and dimethylbenzene series, embedded in paraffin, and then sliced with a microtome and stained with safranine-fast green and finally mounted. The leaves were isolated by Nitric acid Chromate method. The samples of herbs were powdered. Results: The 3 species of "Wu-Jia Vegetables" were studied to compare the distinguishing morphoanatomic details of root, cortex of stem, leaf and petiole, fruit and fruit stalk, and powders. The microscopic features were systematically described and illustrated. And detailed key authentication parameters based on these anatomic characteristics were presented. A key was constructed to the 3 species for convenient classification. Conclusion: This method was simple, accurate and repeatable. It was useful for the study of authenticating and distinguishing 3 species of "Wu-Jia Vegetables." [ABSTRACT FROM AUTHOR]