论文部分内容阅读
2011年3月11日日本宫城Mw9.0级大震后的两天九州岛上新燃岳火山发生大规模喷发.此次火山喷发是否是受地震触发所致,以及地震是否同样也会造成富士山火山和长白山火山的喷发成为人们关注的热点.通过对地震造成的区域应力应变场的计算,发现富士山火山、新燃岳火山和长白山火山均处于体膨胀区,在地下10km处体膨胀分别达到~220,~8和~14nano-strain.由同震GPS位移场计算得到的3个火山地区地表面应变也表现为膨胀,符合模型计算结果.考虑到拉张应力可能对岩浆通道产生的扩张作用、对包容在岩浆内二氧化碳气体的分异作用以及由此引发的一系列正反馈过程,此次地震可能造成这些火山活动的增加,应当警惕触发影响可能造成的火山喷发.
On March 11, 2011, two days after the Mw9.0 earthquake in Miyagi, Japan, a large-scale eruption occurred on the Xin-burning-Yue volcano on the island of Kyushu. Whether the volcano erupted was triggered by the earthquake and whether the earthquake would also cause Mount Fuji volcano And the eruption of Changbai Mountain volcano became the focus of attention.According to the calculation of the regional stress-strain field caused by the earthquake, it was found that the Fuji Mountain Volcano, the New Yue Yue Volcano and the Changbaishan Volcano are both in the body expansive zone, and the body expansion reached 10 ~ 8 and ~ 14nano-strain. The surface strain of the three volcanic regions calculated from the coseismic GPS displacement field also showed swelling, which accorded with the model calculation results. Considering the expansion effect that the tensile stress may have on the magma channel, The differentiation of carbon dioxide gas in magma and the resulting series of positive feedback processes may cause these volcanic activities to increase. We should guard against possible volcanic eruption caused by the triggering.