EnvSeis project, Kåfjord

This network of sixteen geophones and six broadbands was installed in Kåfjord, Troms og Finnmark, Norway, to study two rockslides: Njárgavárri and Indre Nordneset. Each study site had three broadbands from September 2023 to June 2025. In addition, were installed and recording: September – November 2023: six geophones on each site; April – August 2024: four geophones at Njárgavárri and ten at Indre Nordneset. The geophones were installed locally around the rockslides while the broadbands were installed one to a few kilometers from the rockslides (except for one of them directly at Indre Nordneset). The geophones in Njárgavárri were first installed as two triangular antennas of four stations each (three in triangle and one in the middle) and were then replaced by a small aperture array around the most active part of the unstable slope. The goal was to record all activities: rock falls, cracking and creeping movements. In Indre Nordneset, the geophone stations were placed in a small aperture array all around the main scarp and surface of failure to record the cracking activity. The geophones are of type 3-D Geophone PE-6/B with DATA-CUBE3 (built-in GPS). The broadbands are of type STS-2.5 with EDR-10 digitizers. Sampling frequency was 400 Hz for geophone stations, 200 Hz broadbands. Gain was at 16 (15.258789 nV/count) for the geophone stations, set on high (100 nV/bit) for the broadband stations. Waveform data is available from the GEOFON data centre, under network code 8I.

该台阵由16台检波器（geophone）与6台宽频带仪器（broadband）组成，布设于挪威特罗姆斯-芬马克郡的卡菲约尔（Kåfjord），用于研究两处岩质滑坡：恩亚尔加瓦里（Njárgavárri）与因德勒·诺尔内塞特（Indre Nordneset）。两处研究点位自2023年9月至2025年6月均各布设3台宽频带仪器。此外，检波器的布设与记录时段分为两阶段：2023年9月至11月，两处点位各布设6台检波器；2024年4月至8月，恩亚尔加瓦里布设4台检波器，因德勒·诺尔内塞特布设10台检波器。检波器布设在滑坡周边的局部区域，而宽频带仪器则布设于滑坡1至数公里范围内（其中1台直接布设于因德勒·诺尔内塞特点位）。恩亚尔加瓦里的检波器最初布设为两组三角台阵，每组各含4个测点（3个构成三角形顶点，1个位于中心），随后被替换为围绕不稳定斜坡最活跃区域的小口径台阵。本次布设的目标为记录所有滑坡相关活动：包括落石、裂隙活动与蠕移运动。因德勒·诺尔内塞特的检波器测点则布设为环绕主滑崖与滑动面的小口径台阵，用于记录裂隙活动。本次使用的检波器为型号3-D Geophone PE-6/B，配套DATA-CUBE3（内置GPS）设备。宽频带仪器则为型号STS-2.5，搭配EDR-10数字采集器。检波器测点的采样频率为400 Hz，宽频带仪器的采样频率为200 Hz。检波器测点的增益设置为16（对应灵敏度15.258789 nV/count），宽频带仪器则设置为高增益档位（对应灵敏度100 nV/bit）。波形数据可通过GEOFON数据中心获取，台网代码为8I。