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报道了距富尔奈斯火山顶8 km处的GEOSCOPE台网甚宽频带地震台观测到的甚长周期的瞬变过程。我们将地震台观测到的地面速度转换成地倾斜并通过与同一拱顶观测室内Blum型传统摆式倾斜仪记录的数据相比较检验了结果。通过比较表明,用水平地震仪测量周期小于25h的地倾斜是有效的。把这种方法用于1991年以来的几次火山喷发和岩浆侵入之前观测到的瞬变过程。由于GEOSCOPE台站到火山顶的距离适中,因而所得到的地傾斜观测值提供了有关火山喷发和岩浆侵入的信息,补充了火山顶部地倾斜观测网提供的有关岩浆源的形态和位置信息。
Reported the very long-period transient process observed by GEOSCOPE very wideband seismic stations 8 km from the top of Furnas. We converted the ground velocities observed by the seismic stations to ground tilt and examined the results by comparison with the data recorded with an indoor Blum-type conventional pendulum inclinometer on the same vault. The comparison shows that it is effective to measure horizontal tilt less than 25h with horizontal seismograph. This method is applied to the transient processes observed before several volcanic eruptions and magmatic intrusions since 1991. Since the GEOSCOPE station is moderately distanced from the top of the volcano, the resulting dip observations provide information on volcanic eruptions and magma intrusion, complementing the information on magma source morphology and location provided by the Observatory at the top of the volcano.