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<abstract> Universal Mobile Telecommunications System (UMTS) and its evolutions arenowadays the most affordable and widespread data communication infrastructureavailable almost world wide.Moreover the always growing cellular phone market is pushing the developmentof new devices withhigher performances and lower power consumption.All these characteristics make UMTS really useful for theimplementation ofan â easy to deployâ temporary real-time seismic station.Despite these remarkable features, there are many drawbacks that mustbe properly taken in account toeffectively transmit the seismic data:Internet security, signal and service availability,power consumption.<list list-type="bullet"><list-item>Internet security: exposing seismological data services andseismic stations to the Internetis dangerous, attack prone and can lead to downtimes in the services,so we setup adedicated Virtual Private Network (VPN) service to protect all the connecteddevices.</list-item><list-item>Signal and service availability:while for temporary experiment a carefull planning and an accurate siteselection can minimize the problem, this is not always the case withrapid response networks. Moreover, as with any other leased line,the availability ofthe UMTS service during a seismic crisis is basically unpredictable.Nowadays in Italy during a major national emergency a Committee of the Italian Civil Defenseensures unified management and coordination of emergency activities.Inside it the telecom companies are committed to give support to the crisismanagement improving the standards in their communication networks.</list-item><list-item>Power consumption:it isat least of the order of that of the seismic station and,being related todata flow and signal quality is largely unpredictable.While the most secure option consists in adding a second independent solar powersupply to the seismic station, this is not always a very convenientsolution since it doubles the cost and doubles the equipment on site.We found that an acceptable trade-off is to add aninexpensive Low Voltage Disconnect (LVD) circuitto the UMTS router power supply that switches offthe data transmission when the power is low.This greatly reduces the probability of data loss but lowers the real-timedata availabilty. This approach guarantees on the average a satisfactorydata acquistion rate, only in very few cases and when the real-time data isextremely important for a particular site we needed to double the power supplyon the site.</list-item></list> Overall the UMTS data transmission has been used in most temporary seismicexperiments and in all seismic emergencies happened in Italy since 2010 andhas proved to be a very cost effective approach with real-time data acquisitionrates usually greater than 97â ¯% and all the benefits that resultfrom the fast integration of the temporary data in the National Networkmonitoring system and in the EIDA data bank. </abstract

UMTS rapid response real-time seismic networks: implementation and strategies at INGV