Study on Stability of Stone Monuments through Geological Discontinuities

莫高窟及窟内壁画在短期和长期的各种自然风化作用下受到破坏。为了弄清莫高窟背后的地层条件，采用了各种现场测量方法，即电阻率法、RI通过130 m长的悬崖钻孔的放射性同位素测井和导水率测试，阐明了敦煌莫高窟地区500 km范围内的地震活动与震中距的关系，并从估算烈度的角度与文献记录确认了实际破坏情况。此外，还用一套3个小型地震记录仪测量了单个洞穴中的微动，这使得6个洞穴连续记录6个月。分析了相同裂隙附近的动力响应特性。我们为莫高窟带来的测井系统满足了所需的精度和功能，适合保护工作我们在2010-2012年JSPS基金的帮助下在莫高窟进行的研究为保护石碑提供了宝贵的数据库，包括其对地震活动的风险，通过14年的连续气候观测和电阻率分布，阐明了地下水和盐渍化的局部和全球运动。

The Mogao Grottoes and the wall paintings in the caves are damaged due to various natural weathering processes in short- period and long-period. To clarify the ground condition behind the Mogao Grottoes, various in-situ measurements have been applied, namely electric resistivity method, RI (radio-isotope) logging through the 130 m long drill holes above the cliff and water conductivity tests.The seismic activities around Mogao, Dunhuang Area were clarified in the relation with epicentral distance in the 500 km range, and the actual damages were confirmed with the document records from the estimated intensity point of view. And also, micro tremors in individual caves were measured with a set of 3 compact earthquake recorders, which enabled 6 month continuous logging in 6 caves. The dynamic response behavior near identical fissures was analyzed. The logging system, which we brought to the Mogao Caves, satisfied the required accuracy and function, fitting to the preservation worksThe research, which we carried out at the Mogao Caves by aid of the 2010-2012 JSPS Fund, provided a valuable database for the preservation of stone monuments, including its risk against seismic activities, and clarified the local and global movements of ground-water and salinization through the continuous climate observation over 14 years as well as the electric resistivity distribution.