地热现象
- 网络geothermal phenomenon
地热现象-
实验研究证实，在火山喷发前兆期，火山区有明显的突发性地热异常现象。
A lot of experiments have proved that there is an obvious abrupt geothermal anomaly in volcanic region before volcanic eruption .
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河北省部分煤矿区存在地热异常现象，地温梯度最高可达6℃/100m，形成矿井热害。
Abnormal geotemperatures exist in part of coal mines in Hebei Province . The highest gradient of rock temperature is 6 ℃ / 100m .