# Network Code	Network Name	Network Operator	Network Country (ISO & Name)	Network Website	Deployment Country (if different)	Digital Object Identifier (DOI)
C	Chilean National Seismic Network	Universidad de Chile, Dept de Geofisica (DGF UChile Chile)	CL (Chile)		Chile	
C0	Colorado Geological Survey Seismic Network	Colorado Geological Survey	US (United States)		United States	10.7914/SN/C0
C1	Red Sismologica Nacional	Universidad de Chile	CL (Chile)	http://www.sismologia.cl/	Chile	10.7914/SN/C1
C2	Canadian National Geomagnetic Network	Natural Resources Canada (NRCAN Canada)	CA (Canada)	http://www.geomag.nrcan.gc.ca/obs/default-en.php	Canada	
C3	Central and East European Earthquake Research Network	Central and East European Earthquake Research Network	AT (Austria)	http://www.ce3rn.eu/	Austria	10.7914/SN/C3
C4	CERN Seismic Network	CERN	M7 (Multiple Countries)		Multiple Countries	
C7	Red Sísmica Canaria	Instituto Volcanológico de Canarias	ES (Spain)		Canary Islands, Spain	10.7914/SN/C7
CA	Catalan Seismic Network	Institut Cartogràfic i Geològic de Catalunya-Institut d'Estudis Catalans	ES (Spain)	http://www.icgc.cat/xarxasismica	Catalonia	10.7914/SN/CA
CB	Data Management Centre of China National Seismic Network at Institute of Geophysics, CEA	Institute of Geophysics China Earthquake Administration (IGPCEA)	CN (China)	http://www.seisdmc.ac.cn	China	10.7914/SN/CB
CC	Cascade Chain Volcano Monitoring	Cascades Volcano Observatory/USGS	US (United States)	http://volcanoes.usgs.gov/observatories/cvo/	United States	10.7914/SN/CC
CD	China Digital Seismograph Network	Albuquerque Seismological Laboratory (ASL)/USGS	US (United States)		United States	10.7914/SN/CD
CE	California Strong Motion Instrumentation Program	California Division of Mines and Geology (CDMG)	US (United States)		United States	
CF	Red Acelerografica Nacional de la Comision Federal de Electricidad (CFE)	Comision Federal de Electricidad (CFE)	MX (Mexico)		Mexico	
CG	Coso Microearthquake Network	Geothermal Program Office/US Navy	US (United States)		United States	
CH	Switzerland Seismological Network	Swiss Seismological Service	CH (Switzerland)		Switzerland	10.12686/sed/networks/ch
CI	Southern California Seismic Network	California Institute of Technology and United States Geological Survey Pasadena	US (United States)	http://www.scsn.org/	United States	10.7914/SN/CI
CJ	Community Seismic Network	California Institute of Technology (Caltech)	US (United States)	http://csn.caltech.edu/	United States	
CK	CAREMON Central Asian Cross-border network	GEOFON Program (GFZ-Potsdam, Germany)	DE (Germany)		Central Asia	
CL	Corinth Riff Laboratory	Institut de Sciences de l'Univers (INSU)	FR (France)		Greece	10.15778/RESIF.CL
CM	Red Sismologica Nacional de Colombia	INGEOMINAS - Servicio Geologico Colombiano (SGC Colombia)	CO (Colombia)		Colombia	
CN	Canadian National Seismograph Network	Geological Survey of Canada	CA (Canada)	http://www.earthquakescanada.nrcan.gc.ca/stndon/CNSN-RNSC/	Canada	10.7914/SN/CN
CO	South Carolina Seismic Network	University of South Carolina	US (United States)	http://www.seis.sc.edu/projects/SCSN/	United States	10.7914/SN/CO
CP	CIVISA Seismo-Volcanic Monitoring Network-Azores Islands	University of Azores	PT (Portugal)		Portugal	
CQ	Cyprus Broadband Seismological Network	Geological Survey Department Cyprus	CY (Cyprus)	http://81.4.135.34:8080	Cyprus	10.7914/SN/CQ
CR	Croatian Seismograph Network	University of Zagreb	HR (Croatia)		Croatia	
CS	Caucusus Array	Lamont Doherty Earth Observatory (LDEO), Columbia University	US (United States)		Russian Federation	
CT	California Transect Network	UC Santa Cruz	US (United States)		United States	
CU	Caribbean USGS Network	Albuquerque Seismological Laboratory (ASL)/USGS	US (United States)		Caribbean region	10.7914/SN/CU
CV	Vigil Network, Cape Verde Islands	Instituto Superior Tecnico (IST Universidade Tecnica de Lisboa, Portugal)	PT (Portugal)		Portugal	
CW	Servicio Sismologico Nacional de Cuba	National Centre for Seismological Research (CENAIS Cuba)	CU (Cuba)	http://www.cenais.cu	Cuba	10.7914/SN/CW
CX	Plate Boundary Observatory Network Northern Chile	GFZ / IGPP / CSN / UdC / UCNA	M7 (Multiple Countries)	http://www.ipoc-network.org/index.php/data/cx-net.html	Multiple Countries	10.14470/PK615318
CY	Cayman Islands	Cayman Islands Government	KY (Cayman Islands)		Cayman Islands	
CZ	Czech Regional Seismic Network	Institute of Geophysics, Academy of Sciences of the Czech Republic	CZ (Czech Republic)	http://www.ig.cas.cz/en/structure/observatories/czech-regional-seismological-network	Czech Republic	10.7914/SN/CZ