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首页> 外文期刊>Marine Geodesy >Oceanographic Signatures and Pressure Monitoring of Seafloor Vertical Deformation in Near-coastal, Shallow Water Areas: A Case Study from Santorini Caldera
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Oceanographic Signatures and Pressure Monitoring of Seafloor Vertical Deformation in Near-coastal, Shallow Water Areas: A Case Study from Santorini Caldera

机译：近沿海浅水区海底垂直变形的海洋学特征和压力监测：以圣托里尼火山口为例

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摘要

Bottom pressure, tilt, and seawater physical properties were monitored for a year using two instruments within the immerged Santorini caldera (Greece). Piggybacked on the CALDERA2012 cruise, this geodetic experiment was designed to monitor evolution of the 2011-2012 Santorini unrest. Conducted during a quiescent period, it allowed us to study oceanographic and atmospheric signal in our data series. We observe periodic oceanographic signals associated with tides and seiches that are likely linked to both the caldera and Cretan Basin geometries. In winter, the caldera witnesses sudden cooling events that tilt an instrument towards the Southeast, indicating cold water influx likely originating from a passage into the caldera between Thirasia island and the northern end of Thera island to the northwest. We did not obtain evidence of long-term vertical seafloor deformation from the pressure signal, although it may be masked by instrumental drift. However, tilt data suggest a local seafloor tilt event approximate to 1/year after the end of the unrest period, which could be consistent with inflation under or near Nea Kameni. Seafloor geodetic data recorded at the bottom of the Santorini caldera illustrate that the oceanographic signature is an important part of the signal, which needs to be considered for monitoring volcanic or geological seafloor deformation in shallow water and/or nearshore areas.
机译：在沉浸式圣托里尼火山口（希腊）中使用两种仪器对底压，倾斜度和海水物理性质进行了一年的监测。这项大地测量实验搭载在CALDERA2012邮轮上，旨在监控2011-2012年圣托里尼动乱的演变。在静止期进行，它使我们能够研究数据序列中的海洋和大气信号。我们观察到与潮汐和潮汐相关的周期性海洋信号，这些信号可能与火山口和克里特盆地的几何形状有关。在冬季，破火山口会出现突然的降温事件，使仪器向东南倾斜，这表明冷水大量涌入，可能是从Thirasia岛与Thera岛北端至西北之间的破火山口中的一条通道所致。尽管压力漂移可能被仪器漂移掩盖了，但我们并未从压力信号中获得长期垂直海底变形的证据。但是，倾斜数据表明，在动乱期结束后，当地海底倾斜事件大约为每年1年，这可能与Nea Kameni以下或附近的通货膨胀一致。记录在圣托里尼火山口底部的海底大地测量数据表明，海洋特征是信号的重要组成部分，在监测浅水区和/或近岸地区的火山或地质海底变形时需要考虑该信号。

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  • 来源
    《Marine Geodesy》 |2016年第6期|401-421|共21页
  • 作者

    Vilaseca Geraud; Deplus Christine; Escartin Javier; Ballu Valerie; Nomikou Paraskevi; Mevel Catherine; Andreani Muriel;

  • 作者单位

    Univ Paris Diderot, Sorbonne Paris Cite, CNRS UMR 7154, Inst Phys Globe Paris,Marine Geosci Grp, 1 Rue Jussieu, F-75005 Paris 05, France;

    Univ Paris Diderot, Sorbonne Paris Cite, CNRS UMR 7154, Inst Phys Globe Paris,Marine Geosci Grp, 1 Rue Jussieu, F-75005 Paris 05, France;

    Univ Paris Diderot, Sorbonne Paris Cite, CNRS UMR 7154, Inst Phys Globe Paris,Marine Geosci Grp, 1 Rue Jussieu, F-75005 Paris 05, France;

    Univ Rochelle, CNRS, LIENSs, UMR 7266, La Rochelle, France;

    Univ Athens, Fac Geol & Geoenvironm, Athens, Greece;

    Univ Paris Diderot, Sorbonne Paris Cite, CNRS UMR 7154, Inst Phys Globe Paris,Marine Geosci Grp, 1 Rue Jussieu, F-75005 Paris 05, France;

    Univ Lyon, Dept Geol, Lyon, France;

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  • 正文语种 eng
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  • 关键词

    Bottom current; Santorini caldera; seafloor deformation; seafloor pressure; seiches; tiltmeter;

    机译：底流;圣托里尼火山口;海底变形;海底压力;围堰;倾斜仪;

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