A new generation of multichannel seismic apparatus and its practical application in standalone and array monitoring

0371578 - ÚSMH 2012 RIV CZ eng J - Journal Article
Brož, Milan - Štrunc, Jaroslav
A new generation of multichannel seismic apparatus and its practical application in standalone and array monitoring.
Acta geodynamica et geomaterialia. Roč. 8, č. 3 (2011), s. 345-352. ISSN 1214-9705. E-ISSN 2336-4351
R&D Projects: GA ČR GA103/07/1522
Institutional research plan: CEZ:AV0Z30460519
Keywords : analog-to-digital converter * seismic array * weak event
Subject RIV: DC - Siesmology, Volcanology, Earth Structure
Impact factor: 0.530, year: 2011
http://www.irsm.cas.cz/abstracts/AGG/03_11/16_Broz.pdf

A quantitatively new analog-to-digital converter (ADC) module has been developed during 2010, in co-operation with Tedia Ltd. The module has a 28-bit final resolution and uses 32-bit arithmetic. There are two versions, with four and twelve analog inputs. The 4-input module replaces the original 21-bit version, produced until 2009. The 12-input module is intended to be deployed in small-aperture seismic arrays. The whole set consists of four 3-channel detached modules that can be interconnected with the main module using a cable of up to 100 m in length. This design increases signal-to-noise ratio (SNR) by placing the A/D part as close to the seismograph as possible in order to transmit digital data for storage. All channels are sampled coherently so that all four sensors are automatically synchronised. It allows the detection of local events even though the sync-signal is absent. In other words, the 12-input module is suitable for ad-hoc field measurements even in places where there is no GPS signal. All arrays operated by the Institute of Rock Structure and Mechanics (IRSM) are going to be upgraded to use these modules and some new sites will also be set-up with this innovative equipment (e.g. Lazy in Western Bohemia and Dobrá Voda in Slovakia).
Permanent Link: http://hdl.handle.net/11104/0205061