Swedish National Seismic Network

The Swedish National Seismic Network (SNSN) started with the installation
of a Wiechert seismograph in Uppsala in 1904. Since 1998 the SNSN is a
part of the Department of Earth Sciences at Uppsala University. The SNSN
operates the only permanent, earthquake focused seismic network in Sweden
and is responsible for detecting and recording earthquakes in Sweden.
Near real-time automatic event detection has been an integral part of SNSN
operations since 2000 and continuous 100 Hz data has been collected since
2008. Information services is an important part of SNSNs operations, which
includes automatic risk assessment of large global events to Swedish
crisis management authorities, contacts with the authorities, information
to media and the public and outreach to schools. The SNSN operates 65-70
permanent stations, from Lund in southern Sweden to north of Torneträsk.
Approximately one-third of the instruments are 120 s and two-thirds 30 s,
sampling at 100 Hz. The sensors have unusually
high gain, mostly 2x10,000 V/m/s, in order to facilitate detection of
microearthquakes in the regional size network. With an average station
spacing of approximately 65 km, the SNSN is complete to magnitude 0.5 within the
network. The SNSN exports real-time data from 10 stations to ORFEUS and
additional real-time data from stations along the borders to the Danish,
Finnish and Norwegian seismic networks. For inquiries about data from
other stations than the ones exported to ORFEUS, please contact the
SNSN.

瑞典国家地震台网（Swedish National Seismic Network, SNSN）于1904年在乌普萨拉安装首台维歇尔特地震仪（Wiechert seismograph），正式启动运行。1998年起，SNSN隶属于乌普萨拉大学地球科学系。该台网运营着瑞典唯一的永久性地震专项观测网络，负责瑞典境内地震的侦测与记录工作。自2000年起，近实时自动事件侦测便成为SNSN日常运行的核心组成部分；2008年至今，台网已持续采集100Hz的连续波形数据。
信息服务是SNSN运行的重要环节，其服务内容涵盖：针对全球重大地震事件向瑞典危机管理机构提供自动风险评估、对接政府主管部门、向媒体与公众发布相关信息，以及面向学校开展科普推广活动。
SNSN共运营65至70个永久性台站，台站分布覆盖瑞典南部隆德至托尔讷湖以北的广阔区域。约三分之一的仪器为120秒周期传感器，三分之二为30秒周期传感器，所有传感器均以100Hz速率进行采样。为提升区域台网内微地震的侦测能力，传感器具备极高增益，多数可达2×10⁴ V/(m·s)。台站平均间距约65公里，台网可完整侦测台网覆盖范围内震级0.5及以上的地震。
SNSN向ORFEUS机构导出10个台站的实时地震数据，并向丹麦、芬兰、挪威的地震台网共享边境沿线台站的额外实时数据。如需获取未向ORFEUS导出数据的台站相关数据，请联系SNSN。