New Norwegian National Seismic Network Jens Havskov, University of Bergen Jan Fyen, NORSAR Presented at Nordic Detection Seminar, Oslo, June 4-6, 2008

Seismic stations in time

Stations in old NNSN to be used in new NNSN Norwegian National Seismic Network and other seismic stations in Norway. Blue symbols are NNSN stations and red are NORSAR arrays. The station JMIC is operated by NORSAR.

NORSAR stations

10 NORSAR stations to be added NORSAR will contribute near real-time data from three-component broadband stations to NNSN as follows: NOA: one station from each of the 7 subarrays. 6 KS54000, response flat to acceleration. 1 CMG-3T, response flat to velocity. ARCES: 1 CMG-3T, response flat to velocity. SPITS: 1 CMG-3TB, response flat to acceleration. JMIC: 1 STS-2, response flat to velocity. Currently 2 stations are included

Stations outside Norway 3 Finish stations have been added 3 Danish stations have been added 4 British stations have been added

Stations in new network Blue: Existing NNSN Red: NORSAR White: Outside Yellow: New 2008

Norwegian National Seismic Network database, seismic events located with NNSN and other stations

Four earthquakes are located per day. Known and presumed explosion are not included. Earthquakes

Earthquakes , M >3.5

Number of events per year,

Large events located

Felt earthquakes,

New NNSN data Flow EARTWORM Triggering Seismogram generation SEISCOMP SEEDLINK SERVER SEISAN DATA BASE SEISNET Stations with SEEDLink servers Triggers Continuous data NORSAR array solutions Real time display Real time data export

Communication for NNSN Fixed internet, free Internt with ADSL, cheap Interent with ISDN, expensive Internet with mobile phone (3G, Edge or GPRS), medium price

SEEDLink Data transmitted in standardized MiniSeed format 512 byte blocks. Retransmission and error correction SEEDLINK server made by GFZ-Potsdam and integrated in their SEISCOMP acquisition system Used for GEOFON network and others

Triggering Real time data triggered by EartWorm Array solutions and EarthWorm triggers combined with SEISNET Alternative RTDET to EarthWorm being tested Real time triggering combining array and network data will be developed, mainly by NORSAR

Real time monitoring, 15 minutes of data

Event detection RTDET Event detected by RTDE. Uses SEEDLINK as input.

NNSN processing and data access NNSN SEISAN data base NORSAR processing Bergen processing Public data access to events and waveform data Information to the public about Norwegian seismic events

SEISAN data base All waveform data stored in MiniSEED in new network Parameter data stored in Nordic format All events stored separately in event waveform files Continuous data stored in 1 hour files in a SEISAN continuous data base All files can be downloaded by ftp or through web server

Web interface to NNSN data Existing version, new to be made

Public display of recent earthquakes One week of NORSAR data10 days of Bergen data May 24-30, 2008May 21-30, 2008

EARTHWORM helicorder plot

Developments Upgrade network to real time for all stations Upgrade and install new broad band stations Include non Norwegian stations Test and tune EarthWorm Develop routines for joint NORSAR-Bergen processing Develop a system for real time integration of array and network data Develop a new shared web page New NNSN is expected to be in full time opration at end of 2008