Heat flow data from the Hikurangi subduction zone, 2019 (RR1901, RR1902)

This heat flow data set was acquired during R/V Roger Revelle cruises RR1901 and RR1902 conducted in 2019 as part of the project called SAFFRONZ: Slow-Slip and Fluid Flow Response Offshore New Zealand - Probing the Nature of the Hikurangi Margin Hydrogeochemical System. Fluid generation, migration, and pore pressure at subduction zones are hypothesized to exert a primary control on the generation of seismicity, low-frequency earthquakes and slow slip events (SSEs). The Hikurangi margin (east coast of North Island, New Zealand) exhibits dramatic changes in the along-strike depth distribution of SSEs, depth of interseismic coupling, inferred pore pressure, and other subduction-related parameters. In 2019, in-situ measurements of thermal gradient and thermal conductivity were collected using the Oregon State University 3.5-m violin-style multi-penetration heat flow probe. In most cases seeps were targeted to document advective heat flow, if any. The thermistor string houses 11 thermistors and measures both the in-situ thermal gradient and thermal conductivity that are combined to determine the heat flow. On most measurements the probe position was determined with ultra-short baseline telemetry (USBL). The data was processed using SlugHeat (https://marine-heatflow.ceoas.oregonstate.edu/software/). The data file is in Excel spreadsheet format, with column headers. Funding was provided by NSF grants OCE17-53665 and OCE17-53617.

本热流数据集采集自2019年“罗杰·雷维尔号”研究船（R/V Roger Revelle）执行的RR1901与RR1902航次，该航次隶属于SAFFRONZ项目（全称为Slow-Slip and Fluid Flow Response Offshore New Zealand - Probing the Nature of the Hikurangi Margin Hydrogeochemical System，即“新西兰近海慢滑移与流体流动响应：探究希库朗伊俯冲带水文地球化学系统的本质”）。俯冲带的流体生成、运移与孔隙压力被认为是控制地震活动、低频地震及慢滑移事件（Slow Slip Events, SSEs）发生的首要因素。希库朗伊俯冲带地处新西兰北岛东海岸，其沿走向的慢滑移事件深度分布、震间耦合深度、推断孔隙压力及其他俯冲相关参数均存在显著变化。2019年，研究团队使用俄勒冈州立大学（Oregon State University）研发的3.5米小提琴式多穿透热流探针，开展了热梯度与热导率的原位测量。多数测量以海底流体渗漏点为目标，以记录对流热流（若存在）。该探针搭载的热敏电阻串（thermistor string）集成11个热敏元件，可同步采集原位热梯度与热导率数据，二者结合即可计算得到热流值。多数测量任务中，探针位置通过超短基线遥测（ultra-short baseline telemetry, USBL）进行定位。本数据集采用SlugHeat软件（https://marine-heatflow.ceoas.oregonstate.edu/software/）进行处理，数据文件为Excel电子表格格式，包含列标题。本研究获美国国家科学基金会（National Science Foundation, NSF）OCE17-53665与OCE17-53617两项基金资助。