Several laboratory experimental studies of photoemission characteristics of rocks as they fracture have been conducted to elucidate the mechanism of earthquake lightning (EQL). In most of these studies, granite, which exhibits remarkable photoemission, is widely used to explain the mechanism attributed to the exoelectron emission effect or piezo-induced effect of quartz, a constituent mineral of granite. Photoemission induced by rock fracturing has been observed prominently during landslides caused by earthquakes. According to the literature on historical earthquakes, landslide-induced EQL was witnessed even at locations where quartz was not present. In this study, we therefore studied the physicochemical characteristics of photoemissions associated with impact shear fractures in various rocks, selected based on historical earthquake records of landslide EQL. As a result, we could highlight various physicochemical processes associated with the frictional heating generated during shear impacts between rocks.

中文翻译：

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滑坡致地震闪电的实验室调查

为了阐明地震闪电 (EQL) 的机制，已经对岩石断裂时的光电发射特性进行了几项实验室实验研究。在大多数这些研究中，表现出显着光发射的花岗岩被广泛用于解释归因于花岗岩组成矿物石英的外激电子发射效应或压电诱导效应的机制。在地震引起的滑坡期间，已经观察到由岩石破裂引起的光发射。根据有关历史地震的文献，即使在没有石英的地方也能看到滑坡诱发的 EQL。因此，在这项研究中，我们研究了与各种岩石中的冲击剪切断裂相关的光发射的物理化学特性，根据滑坡EQL的历史地震记录选择。因此，我们可以强调与岩石之间剪切冲击过程中产生的摩擦热相关的各种物理化学过程。