Study on Stability of Stone Monuments through Geological Discontinuities

莫高窟石窟和石窟壁画在短期和长期的各种自然风化过程中遭到破坏。为了弄清莫高窟背后的地表条件，采用了多种现场测量方法，即电阻率法、悬崖上方130m长钻孔的放射性同位素测井和导水率测试。从震中距500公里的范围内弄清了敦煌莫高窟周围的地震活动情况，并从烈度估算的角度与文献记录证实了实际的破坏情况。并用3台小型地震记录仪测量了单个洞穴的微震，使6个洞穴连续6个月的记录成为可能。分析了相同裂缝附近的动力响应行为。我们带到莫高窟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开展的研究，为石质古迹的保护提供了宝贵的数据库，包括其对地震活动的风险，并通过14年来的连续气候观测和电阻率分布，阐明了当地和全球地下水和盐碱化的运动。

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.