Istituto Nazionale di Geofisica e Vulcanologia, Sezione di Bologna, via D. Creti 12, 40128, Bologna, Italy.
Istituto Nazionale di Geofisica e Vulcanologia, Sezione di Napoli Osservatorio Vesuviano, via Diocleziano 328, 80124, Napoli, Italy.
Sci Rep. 2017 Jun 30;7(1):4472. doi: 10.1038/s41598-017-04845-9.
The inter-arrival times of the post 2000 seismicity at Campi Flegrei caldera are statistically distributed into different populations. The low inter-arrival times population represents swarm events, while the high inter-arrival times population marks background seismicity. Here, we show that the background seismicity is increasing at the same rate of (1) the ground uplift and (2) the concentration of the fumarolic gas specie more sensitive to temperature. The seismic temporal increase is strongly correlated with the results of recent simulations, modelling injection of magmatic fluids in the Campi Flegrei hydrothermal system. These concurrent variations point to a unique process of temperature-pressure increase of the hydrothermal system controlling geophysical and geochemical signals at the caldera. Our results thus show that the occurrence of background seismicity is an excellent parameter to monitor the current unrest of the caldera.
坎皮弗莱格雷（Campi Flegrei）火山口后 2000 年地震的到达时间间隔在统计学上分布为不同的群体。低到达时间间隔群体代表群集事件，而高到达时间间隔群体则标志着背景地震活动。在这里，我们表明，背景地震活动的增加速度与（1）地面抬升和（2）对温度更敏感的沸腾气体种类的浓度相同。地震时间的增加与最近模拟的结果密切相关，模拟了岩浆流体在坎皮弗莱格雷热液系统中的注入。这些同时发生的变化表明，热液系统的温度-压力升高过程控制着火山口的地球物理和地球化学信号，这是一个独特的过程。因此，我们的结果表明，背景地震活动的发生是监测火山口当前不稳定的一个极好参数。
