Drift‐corrected seafloor pressure observations of vertical deformation at Axial Seamount 2013–2014
Drift‐corrected seafloor pressure observations of vertical deformation at Axial Seamount 2013–2014
复制标题
2013-2014年轴向海山垂直变形的漂移校正海底压力观测结果
DOI：
10.1002/2016ea000190
复制
发表时间：
2016
影响因子：
3.1
通讯作者：
Matthew J. Cook
中科院分区：
文献类型：
--
作者：
G. Sasagawa;M. Zumberge;Matthew J. Cook
胡安德富卡山脊上的轴向海山是一个持续火山活动的地点。用具有良好短期分辨率的环境海水压力计可以观测到形变的垂直分量。然而，压力计漂移增加了长期形变估计的额外和显著的不确定性；观测到的漂移率相当于20-30 厘米/年。绕过压力计漂移的一种方法是相对于一个遥远且可能稳定的海底参考点进行压差测量。这样的测量需要远程操作的车辆，而且只能很少进行。另一种办法是在海底压力记录器中加入活塞式压力计校准器，以产生现场参考压力，当周期性地施加到易漂移的压力计上时，可用于确定压力计的漂移并从时间序列中消除该压力计的漂移。我们建造了一台自校准压力记录器，并于2013年9月将其部署在轴海山。该部署的漂移校正记录显示，火山顶峰在17个 月内上升了60 厘米。
Axial Seamount on the Juan de Fuca Ridge is a site of ongoing volcanic activity. The vertical component of the deformation can be observed with ambient seawater pressure gauges, which have excellent short‐term resolution. However, pressure gauge drift adds additional and significant uncertainty in estimates of long‐period deformation; drift rates equivalent to 20–30 cm/yr have been observed. One way to circumvent gauge drift is to make differential pressure measurements relative to a distant and presumably stable seafloor reference site. Such measurements require a remotely operated vehicle and can only be made infrequently. Another approach is to incorporate a piston gauge calibrator in the seafloor pressure recorder to generate an in situ reference pressure that, when periodically applied to the drift‐susceptible gauge, can be used to determine and remove gauge drift from the time series. We constructed a self‐calibrating pressure recorder and deployed it at Axial Seamount in September 2013. The drift‐corrected record from that deployment revealed an uplift of the volcano summit of 60 cm over 17 months.