Abstract. We release two datasets that track the enhanced landsliding induced by the
2008 Mw 7.9 Wenchuan earthquake over a portion of the Longmen
Mountains, at the eastern margin of the Tibetan Plateau (Sichuan, China). The
first dataset is a geo-referenced multi-temporal polygon-based inventory of
pre- and coseismic landslides, post-seismic remobilisations of coseismic
landslide debris and post-seismic landslides (new failures). It covers
471 km2 in the earthquake's epicentral area, from 2005 to 2018. The
second dataset records the debris flows that occurred from 2008 to 2017 in a
larger area (∼17 000 km2), together with information on their
triggering rainfall as recorded by a network of rain gauges. For some
well-monitored events, we provide more detailed data on rainfall, discharge,
flow depth and density. The datasets can be used to analyse, on various
scales, the patterns of landsliding caused by the earthquake. They can be
compared to inventories of landslides triggered by past or new earthquakes or
by other triggers to reveal common or distinctive controlling factors. To our
knowledge, no other inventories that track the temporal evolution of
earthquake-induced mass wasting have been made freely available thus far. Our
datasets can be accessed from https://doi.org/10.5281/zenodo.1405489.
We also encourage other researchers to share their datasets to facilitate
research on post-seismic geological hazards.
Purpose -To provide a solution for PCB drilling with strict requirements on hole wall quality. Design/methodology/approach -The influential mechanism of key micro drill bit parameters on hole wall roughness is analyzed. A new type of micro drill bit is developed on the basis of theoretical analysis and experimental verifications. Findings -The key factors in drill bit design which can enable superior hole wall quality are described. Experimental results show that very good hole wall quality is achieved by such newly developed drill bits. Meanwhile, the new drill bits show good performance in terms of wear-resistance and hole registration accuracy. A solution for PCB drilling with strict requirements on hole wall quality is provided. Originality/value -The paper highlights the influential mechanism of key parameters of micro drill bit design on the hole wall quality of PCBs. A new kind of micro drill bit which can achieve superior hole wall quality has been developed.
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