Database of pyroclastic cover deposit thickness measurements (PT-Cam) in peri-volcanic areas of Campania (Italy)

In an eruptive event, tephra deposits (i.e. ash and pumice) disperse in the atmosphere and deposit on the ground surface according to the speed and direction of the wind. Because the geotechnical and hydraulic properties of the unconsolidated pyroclastic fall deposits usually differ from the bedrock, their spatial thickness significantly influences geomorphological and hydrogeological processes such as landscape evolution, erosion, landslide, and hillslope hydrogeology. The PT-Cam database presents the thickness of tephra deposits (i.e. the unconsolidated materials over the bedrock) in Campania region (Italy), measured through in-situ investigations of some territories around the Somma-Vesuvius, Campi Flegrei, Roccamonfina, and Ischia volcanoes during the last decades. The measurements were conducted with probing tests, dynamic penetration tests, trenches, man-made pits, seismic surveys, and outcrops. Explanation for database attribute: CODE: identification code of the measurement; z: measured thickness expressed in cm; type_z: thickness type (i.e. if investigation has reached to the bedrock the type is “total” otherwise it is “partial”); type_investigation: method of in-situ investigation; locality: municipality to which the measurement point belongs; Longitude, Latitude: km coordinates in UTM WGS 84 system.在火山喷发事件中，火山碎屑沉积（tephra deposits，即火山灰与浮石）会在大气中弥散，并依照风速与风向沉降至地表。由于未固结火山碎屑降落沉积的岩土与水文物性通常与基岩存在显著差异，其空间厚度会对地貌演化、侵蚀、滑坡以及山坡水文地质等地貌与水文地质过程产生重要影响。 PT-Cam数据库收录了意大利坎帕尼亚大区（Campania region）内火山碎屑沉积层（即覆盖于基岩之上的未固结物质）的厚度数据，这些数据是近数十年来针对索马-维苏威火山、坎皮佛莱格瑞火山、罗卡蒙菲纳火山与伊斯基亚火山周边部分区域开展原位调查所测得的。本次测量采用了探测试验、动力触探试验、探槽、人工坑槽、地震勘探与露头观测等手段完成。 数据库属性说明如下： CODE：测量点识别码； z：以厘米（cm）为单位的实测厚度； type_z：厚度类型（即当调查已穿透覆盖层抵达基岩时，类型为「全厚度（total）」，否则为「部分厚度（partial）」）； type_investigation：原位调查方法； locality：测量点所属的市辖区； Longitude、Latitude：采用UTM WGS 84坐标系的千米级坐标。