Vertical deformation before and after the 2022 Menyuan Ms6.9 earthquake and analysis of earthquake precursors

This study analyzed the vertical deformation before and after the 2022 Menyuan Ms6.9 earthquake in Qinghai Province,China,using leveling profiles across faults measured from Minle County in Gansu Province to Menyuan County in Qinghai Province.Our results suggest the following:(1)The amplitude of regional vertical differential motion near the Sunna-Qilian and Lenglongling faults within the Qilian Shan increased before the 2022 Menyuan earthquake.It was accompanied by the emergence of high gradient deformation zones.Deformation at the Tongziba cross-fault leveling site near the Sunan-Qilian fault was considerable.In contrast,deformation at the Daliang cross-fault leveling site near the stepover region(adjacent to the epicenter)between the Lenglongling and Tuolaishan faults was minor.After 2018,vertical deformation at the Tongziba site notably accelerated,while that at the Daliang site was insignificant.(2)After the 2022 Menyuan earthquake,140—150 mm of subsidence deformation occurred near the Daliang site,while the Tongziba site did not experience significant deformation.(3)Vertical deformation before and after the 2022 Menyuan earthquake conforms with the elastic-rebound theory,and the evolution of pre-earthquake deformation was consistent with the strike-slip fault deformation pattern at different seismogenic stages,i.e.,the relative motion near the locked fault in the late seismogenic stage gradually weakened.The characteristics of strain accumulation and release derived from the vertical deformation before and after the Menyuan MS6.9 earthquake help understand the deformation process of earthquake preparation and earthquake precursors.

非洲猪瘟背景下规模化猪场饲料生产管理关键技术

非洲猪瘟是一种严重危害我国养猪产业发展的烈性传染病。饲料原料以及产品作为非洲猪瘟病毒的良好载体,成为规模化猪场中非洲猪瘟传播的主要途径之一,并且会延长致病性。因此,规模化猪场对于饲料的生产安全管理越来越严格。文章根据非洲猪瘟病毒的传播特征及耐受性,综述了规模化猪场饲料生产管理的技术与经验,以及饲料的生产、运输及投喂等环节的关键点,为规模化猪场如何防止非洲猪瘟病毒从饲料途径感染猪群,以及怎样在非洲猪瘟背景下保障猪场的健康养殖提供参考。