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首页> 外文期刊>Geophysical Research Letters >Subsidence of Campi Flegrei (Italy) detected by SAR interferometry
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Subsidence of Campi Flegrei (Italy) detected by SAR interferometry

机译:SAR干涉法检测到Campi Flegrei(意大利)的沉降

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摘要

Seven ERS SAR images of the Napoli area acquired from 1993 to 1996 were used to create six differential interferograms. Although the ambiguity height of the selected couples is high, because of the adverse characteristics of the area, the interferograms exhibit a relatively low level of coherence, even for couples sampling short time intervals. According to the estimated accuracy, no deformation is observed on Vesuvio volcano. The best interferogram, corresponding to the period Feb. 14, 1993 - Apr. 3, 1996, shows that the centre of the Campi Flegrei caldera, near Pozzuoli harbour, subsided by about three fringes (84 mm) during the three years interval. This result is consistent with the value of 28 ± 2 mm/year obtained from routine levelling surveys over the same period in the same area. The deflation that started after the 1983-1984 seismic and inflation crisis is thus still significant. The modelling of the fringe pattern, assuming a spherical deflating source within an elastic half-space medium, predicts a source centred about 800 m Southwest of Pozzuoli at a depth of 2.7 ± 0.3 km. For the studied time window, the maximum subsidence predicted by the model is 25 mm/year.
机译:从1993年至1996年获取的那不勒斯地区的7幅ERS SAR图像用于创建6幅差分干涉图。尽管所选对的模糊度很高,但由于该区域的不利特性,即使对短时间间隔的夫妇进行采样,干涉图也显示出较低的相干性。根据估计的准确性,在维苏威火山上未观察到变形。最佳干涉图对应于1993年2月14日至1996年4月3日,这表明在波佐利港附近的Campi Flegrei破火山口的中心在三年间隔内约有三个条纹(84毫米)平息。该结果与在同一时期内同一时期的例行水准测量获得的28±2 mm /年的值一致。因此,1983年至1984年地震和通货膨胀危机之后开始的通货紧缩仍然很重要。假设在弹性半空间介质中存在球形放气源,则条纹图案的建模将预测源位于波佐利西南约800 m处,深度为2.7±0.3 km。对于研究的时间窗口,模型预测的最大沉降为25毫米/年。

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