Saxonian Seismological Online Network SXNET -

overview

S. Funke, S. Wendt*, M. Korn Institute of Geophysics and

Geology, University of Leipzig, Germany; *Collm Observatory

Topics

• Motivation

• Cooperation

• Technical details

Part II:

• SeisComP software in SXNET – experiences and wishes

Seismicity in Saxony

Earthquakes in Germany and vicinity 800 – 2000(Leydecker, 2002)

B

Networks in Saxony

SXNET online

SXNET offline

Neighbours

GRSN

Cooperations – networks of the neighbours

• TU BA Freiberg – Offline SXNET

• Univ. Jena – OTSN

• SZGRF Erlangen – GRSN

• Univ. München – Bavarian network

• GI-ASCR Praha – WEBNET

• Univ. Brno – KRASNET

Technical data (SXNET online)

• 8 stations• Seismometer: 6 x Le3D-5s, 2 x STS-2;

1 x Geophon 4.5 Hz• Digitizer: 24 Bit, 100 Hz, 1 x 200 Hz

(Quanterra, EarthData)• Continuous data acquisition• Data transmission via SeedLink (ISDN)• Calling interval 10 min

Example: station GUNZ

WUET

Wüstenhain

WERN

Wernitzgrün

Part II: SeisComP software in SXNET –

experiences and wishes

Data flow (I)

• Basics:– Hardware: standard

PC‘s

– OS: SuSE Linux

– Data acquisition: SeisComP

– Data transmission: SeedLink

• Station site:– miniSEED files

– ring buffer 100 days, mirroring

– seedlink buffer 7 days

– one CD per two weeks

Data flow (II)

• Data center (Leipzig)– data calls via ISDN

(dial up every 10 min)

– seedlink buffer 3 days

– further stations via internet:

• NKC 20 Hz

• FBE 100 Hz

• ROTZ 200 Hz

– ca. one DVD per week

• Collm observatory via internet:– Data analysis

• SZGRF Erlangen via internet

• ...

SeisComP + SXNET (I)• Continuous data, sampling rate 100 Hz,

dial-up network (ISDN)

• Mirroring – two versions:– SZGRF „processdayfiles“– RAID1

• Automatic backup at the station site on CD/DVD („processdayfiles“)

• Data delay of the data center max. 10 min

SeisComP + SXNET (II)• „Fifo“ after broken line

• Special case WERN:– reverse dial-up, analoguous phone line– 6-channel EarthData, sampling rate 200 Hz– handshaking between digitizer and data

aquisition

WERN

Wernitzgrün

SeisComP – small wishes(Version 2.5 not yet tested in Leipzig)

• „Show active file“ like versions 1.x

• Easier configuration:– Private templates or – private defaults

• Localization of menues (german)

Thanks ...

• ... for the powerful software,

• ... for founding:

Sächsisches Landesamt für Umwelt und Geologie,

• ... to all neighboured networks for exchanging data,

• ... to you!