MOBNET is a pool of seismic stations installed temporarily in tectonically different regions in the frame of collaborative seismic experiments. The pool has been developed step by step since 1998 and it consisted of 65 portable units at the end of 2016. Pairs of seismometer-data acquisition systems create each of the mobile units. About half of seismometers of the pool are the short period Lennartz Le-3D (32 pieces), the rest are tree-component broad-band seismometers – STS2 and Guralp (CMG-3T, CMG-3ESP, CMG-40T). GAIA data acquisition systems work mostly in offline regime, reporting daily the state-of-health for all of the stations via ‘sms’. Online data transmission is also possible.

Previously, the stations of the pool have been involved, e.g., in the RETREAT (N. Apennines), LAPNET (N. Finland), PASSEQ (central Europe), MOSAIC, and BOHEMA (Bohemian Massif) passive seismic experiments. Currently, twenty broad-band stations are involved in the large collaborative European project AlpArrayand have been involved in the AlpArray complementary passive experiment EASI.
 

Contact:
Jan Šílený
Institute of Geophysics
Boční II/1401, 14131 Prague 4
jsi@ig.cas.cz

Data acquisition systems

Vistec/Gaia I (30 units), (in Czech only)
Vistec/Gaia II (17 units) (in Czech only)

Seismometers

32 short-period 3-component seismometers Le3D
15 broad-band 3-component seismometers STS-2

MOBNET stations included in projects as follows:

Project AlpArray(a broad international cooperation)

Network coordinator: J. Plomerová
Instruments: 20 Vistec/Gaia, 20 broad-band seismometers
Location: Bohemian Massif (Czech Republic)
Period: August 2015 – will be active by the end of 2018
Purpose: study of the crust and upper mantle beneath the Alps and their surroundings

Project AlpArray-EASI (a broad international cooperation) 

Network coordinator: J. Plomerová
Instruments: 20 Vistec/Gaia, 20 broad-band seismometers
Location: Bohemian Massif (Czech Republic, Germany)
Period: August 2014 – August 2015
Purpose: study of the crust and upper mantle structure from the Bohemian Massif, across the Alps towards the Venezia Basin

Project REYKJANET

Network coordinator: J. Horálek
Instruments: 15 Vistec/Gaia, 14 CMG-40T, 1 Le3D
Location: SW Iceland
Period: August 2013 – present
Purpose: Monitoring of earthquake swarms in the Reykjanes peninsula

Project BOHEMA IV

Network coordinator: J. Plomerová
Instruments: 11 Vistec/Gaia, 11 broad-band seismometers
Location: Czech Republic
Period: November 2012 –July 2014
Purpose: study of velocity structure and anisotropy of the upper mantle in contact of the Brunovistulian unit with the eastern Bohemian Massif

Project EgerRift

Network coordinator: J. Plomerová
Instruments: 30 Vistec/Gaia, 15 broad-band and 15 Le3D seismometers
Location: Czech Republic, Germany
Period: August 2007-January 2011
Purpose: study of velocity structure and anisotropy of the upper mantle around the Eger Rift

Project LAPNET
Network coordinator: J. Plomerová
Instruments: 5 Gaia, 5 STS-2 seismometres
Location: northern Finland
Period: August 2007 – September 2009
Purpose: study of the upper mantle structure of northern Fennoscandian Shield

Project PASSEQ (broad international cooperation)

Network coordinator: J. Plomerová
Instruments: 24 Gaia, 11 broad-band seismometers (STS-2, CMG-3T,-ESP, -40T), 13 Le-3D
Location: Bohemian Massif (Czech Republic) and Poland
Period: July 2006 – July 2008
Purpose: study of the upper mantle structure across the Trans-European Suture Zone (TESZ)

Project WEBNET

Network coordinator: J. Horálek
Instruments: 14 Vistec/Gaia, 14 Le3D
Location: West Bohemia
Period: June 2006 – June 2008
Purpose: Monitoring of earthquake swarms in West Bohemia

Project BOHEMA III

Network coordinator: J. Plomerová
Instruments: 17 Vistec/Gaia, 5Vistec/Jupiter; 11 Le3D, 11 broad-band seismometers Location: Czech Republic, Austria
Period: June 2005 – August 2006
Purpose: study of velocity structure and anisotropy of the upper mantle beneath southern Bohemian Massif

Project BOHEMA II(Czech- German co-operation)

Network coordinator: J. Plomerová, V. Babuška
Instruments: 17 Vistec/Gaia, 5Vistec/Jupiter; 11 Le3D, 11 broad-band seismometers
Location: Czech Republic
Period: March 2004 – June 2005
Purpose: study of study of velocity structure and anisotropy of the upper mantle beneath northern Bohemain Massif

Project RETREAT(US – Italian – Czech co-operation)

Network coordinator: J. Plomerová, V. Babuška
Instruments: 10 Vistec/Gaia, 10 STS-2
Location: Northern Apennines, N. Italy
Period: Autumn 2003 – Autumn 2006
Purpose: study of anisotropy of the upper mantle

Project BOHEMA (Czech-French-German co-operation)

Network coordinator: J. Plomerová, V. Babuška
Instruments: 6 Vistec/Jupiter DAS, 2 CMG-3T, CMG-40T 3 CMG-3ESP
Location: Czech Republic
Period: September 2001– January 2003
Purpose: study of velocity structure and anisotropy of the upper mantle beneath the western Bohemain Massif

Project MOSAIC (Czech-French co-operation)
Network coordinator: J. Plomerová
Instruments: 3 Vistec/Jupiter DAS, 2 CMG-3T, CMG-40T
Location: Czech Republic
Period: August 1998 – Duben 1999
Purpose: pilot study of velocity structure and anisotropy of the upper mantle beneath the Bohemian Massif