# Network Code	Network Name	Network Operator	Network Country (ISO & Name)	Network Website	Deployment Country (if different)	Digital Object Identifier (DOI)
H2	Hawaii 2 Observatory	University of Hawaii	United States of America	http://www.soest.hawaii.edu/H2O/	United States of America	
HA	Hellenic Seismological Network, University of Athens, Seismological Laboratory	University of Athens	Greece	http://dggsl.geol.uoa.gr/	Greece	10.7914/SN/HA
HC	Seismological Network of Crete	Technological Educational Institute of Crete	Greece	http://gaia.chania.teicrete.gr/uk/	Crete and South Aegean, Greece	10.7914/SN/HC
HE	Finnish National Seismic Network	University of Helsinki	Finland		Finland	10.14470/UR044600
HF	Swedish Seismic Array Network	Swedish Defence Research Agency	Sweden	http://snsn.geofys.uu.se/	Sweden	
HG	High-Gain Long-Period Network	Albuquerque Seismological Laboratory/USGS	United States of America		Global 	10.7914/SN/HG
HI	ITSAK Strong Motion Network	Institute of Engineering Seimology Earthquake Engineering	Greece		Greece	10.7914/SN/HI
HK	Hong Kong Seismograph Network	Hong Kong Observatory	China	http://www.hko.gov.hk/gts/equake/sp_seismo_network_intro_e.htm	China	
HL	National Observatory of Athens Seismic Network	National Observatory of Athens, Institute of Geodynamics, Athens	Greece	http://bbnet.gein.noa.gr	Greece	10.7914/SN/HL
HM	GeoRisk Seismic Network	 GeoRisk Earthquake Engineering	Hungary	http://www.foldrenges.hu	Hungary	10.7914/SN/HM
HN	Hungarian National Infrasound Network	Institute of Earth Physics and Space Science	Hungary		Hungary	10.14470/UA114590
HP	University of Patras, Seismological Laboratory	University of Patras	Greece	http://seismo.geology.upatras.gr/heliplots	Greece	10.7914/SN/HP
HR	Croatian Research Seismic Network	University of Zagreb	Croatia		Croatia	
HS	Hessischer Erdbebendienst	Hessian Agency for Nature Conservation, Environment and Geology	Germany	https://www.hlnug.de/themen/geologie/erdbeben	Germany	10.7914/SN/HS
HT	Aristotle University of Thessaloniki Seismological Network	Aristotle University of Thessaloniki	Greece	http://geophysics.geo.auth.gr/the_seisnet/WEBSITE_2005/station_index_en.html	Greece	10.7914/SN/HT
HU	Hungarian National Seismological Network	Institute of Earth Physics and Space Science	Hungary	http://www.seismology.hu/index.php/en/observatory/stations	Hungary	10.14470/UH028726
HV	Hawaiian Volcano Observatory Network	USGS Hawaiian Volcano Observatory	United States of America	http://hvo.wr.usgs.gov	United States of America	10.7914/SN/HV
HW	Hanford Washington Seismic Network	Pacific Northwest National Laboratory	United States of America		United States of America	
HY	UEH Seismic Network	Université d'Etat d'Haiti	Haiti		Haiti	10.7914/SN/HY
HZ	Hasting Micro-Seismic Consulting	Private Consulting Service	United States of America	http://hmscinc.net	United States of America	10.7914/kha2-md06