<?xml version="1.0" encoding="UTF-8"?>
<FDSNStationXML xmlns="http://www.fdsn.org/xml/station/1" schemaVersion="1.1" xsi:schemaLocation="http://www.fdsn.org/xml/station/1 http://www.fdsn.org/xml/station/fdsn-station-1.1.xsd" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:resif="http://www.fdsn.org/xml/station/1/resif">
<Source>RESIF-SI</Source><Sender>RESIF-DC</Sender>
<Module>RESIF WEB SERVICE: fdsnws-station | version: 1.1.1 </Module>
<ModuleURI>http://ws.resif.fr/fdsnws/station/1/query?network=FR&amp;station=HELF&amp;level=channel</ModuleURI> 
<Created>2026-04-16T00:57:51Z</Created>
<Network code="FR" alternateCode="RLBP" startDate="1962-01-01T00:00:00" endDate="2500-12-31T23:59:59" restrictedStatus="open"><Description>RESIF and other Broad-band and accelerometric permanent networks in metropolitan France</Description><Identifier type="DOI">10.15778/RESIF.FR</Identifier><Operator><Agency>Réseau large-bande permanent (RLBP)</Agency><WebSite>https://rlbp.resif.fr</WebSite></Operator><TotalNumberStations>202</TotalNumberStations><SelectedNumberStations>1</SelectedNumberStations>
<Station code="HELF" startDate="2013-10-02T00:00:00" endDate="2500-12-31T23:59:59" restrictedStatus="open" resif:alternateNetworkCodes="FR"><Latitude>50.70492</Latitude><Longitude>2.24139</Longitude><Elevation>100</Elevation><Site><Name>Helfaut</Name><Description>administrative code : 62423</Description><Town>Helfaut</Town><County>Pas-de-Calais</County><Region>Hauts-de-France</Region><Country>France</Country></Site><Operator><Agency>Institut de physique du globe de Paris (IPGP)</Agency><Contact><Email>data@obs.resif</Email></Contact><WebSite>https://www.ipgp.fr</WebSite></Operator><CreationDate>2013-10-02T00:00:00</CreationDate><TotalNumberChannels>15</TotalNumberChannels><SelectedNumberChannels>15</SelectedNumberChannels>
<Channel locationCode="00" code="BHE"  startDate="2020-09-05T12:00:00" endDate="2022-01-20T06:15:00" restrictedStatus="open"><Comment><Value>STATUS: RLBP national</Value><BeginEffectiveTime>2020-09-05T12:00:00Z</BeginEffectiveTime><EndEffectiveTime>2022-01-20T06:15:00Z</EndEffectiveTime><Author><Name>Observatoire de la Côte d''Azur</Name><Email>network.oca@resif.fr</Email></Author></Comment><Latitude>50.70492</Latitude><Longitude>2.24139</Longitude><Elevation>100</Elevation><Depth>0</Depth><Azimuth>90</Azimuth><Dip>0</Dip><Type>CONTINUOUS</Type><Type>GEOPHYSICAL</Type><SampleRate>20</SampleRate><Sensor><Description>TRILLIUM-120QA broad band triaxial sensor by Nanometrics</Description><Model>TRILLIUM-120QA</Model><SerialNumber>002755</SerialNumber></Sensor><DataLogger><Description>CENTAUR data acquisition system by Nanometrics</Description><Model>CENTAUR</Model><SerialNumber>2783</SerialNumber></DataLogger><Response><InstrumentSensitivity><Value>4.81e+08</Value><Frequency>1</Frequency><InputUnits><Name>m/s</Name><Description>meter per second (velocity)</Description></InputUnits><OutputUnits><Name>count</Name><Description>digital counts</Description></OutputUnits></InstrumentSensitivity></Response></Channel> 
<Channel locationCode="00" code="BHN"  startDate="2020-09-05T12:00:00" endDate="2022-01-20T06:15:00" restrictedStatus="open"><Comment><Value>STATUS: RLBP national</Value><BeginEffectiveTime>2020-09-05T12:00:00Z</BeginEffectiveTime><EndEffectiveTime>2022-01-20T06:15:00Z</EndEffectiveTime><Author><Name>Observatoire de la Côte d''Azur</Name><Email>network.oca@resif.fr</Email></Author></Comment><Latitude>50.70492</Latitude><Longitude>2.24139</Longitude><Elevation>100</Elevation><Depth>0</Depth><Azimuth>0</Azimuth><Dip>0</Dip><Type>CONTINUOUS</Type><Type>GEOPHYSICAL</Type><SampleRate>20</SampleRate><Sensor><Description>TRILLIUM-120QA broad band triaxial sensor by Nanometrics</Description><Model>TRILLIUM-120QA</Model><SerialNumber>002755</SerialNumber></Sensor><DataLogger><Description>CENTAUR data acquisition system by Nanometrics</Description><Model>CENTAUR</Model><SerialNumber>2783</SerialNumber></DataLogger><Response><InstrumentSensitivity><Value>4.81e+08</Value><Frequency>1</Frequency><InputUnits><Name>m/s</Name><Description>meter per second (velocity)</Description></InputUnits><OutputUnits><Name>count</Name><Description>digital counts</Description></OutputUnits></InstrumentSensitivity></Response></Channel> 
<Channel locationCode="00" code="BHZ"  startDate="2020-09-05T12:00:00" endDate="2022-01-20T06:15:00" restrictedStatus="open"><Comment><Value>STATUS: RLBP national</Value><BeginEffectiveTime>2020-09-05T12:00:00Z</BeginEffectiveTime><EndEffectiveTime>2022-01-20T06:15:00Z</EndEffectiveTime><Author><Name>Observatoire de la Côte d''Azur</Name><Email>network.oca@resif.fr</Email></Author></Comment><Latitude>50.70492</Latitude><Longitude>2.24139</Longitude><Elevation>100</Elevation><Depth>0</Depth><Azimuth>0</Azimuth><Dip>-90</Dip><Type>CONTINUOUS</Type><Type>GEOPHYSICAL</Type><SampleRate>20</SampleRate><Sensor><Description>TRILLIUM-120QA broad band triaxial sensor by Nanometrics</Description><Model>TRILLIUM-120QA</Model><SerialNumber>002755</SerialNumber></Sensor><DataLogger><Description>CENTAUR data acquisition system by Nanometrics</Description><Model>CENTAUR</Model><SerialNumber>2783</SerialNumber></DataLogger><Response><InstrumentSensitivity><Value>4.81e+08</Value><Frequency>1</Frequency><InputUnits><Name>m/s</Name><Description>meter per second (velocity)</Description></InputUnits><OutputUnits><Name>count</Name><Description>digital counts</Description></OutputUnits></InstrumentSensitivity></Response></Channel> 
<Channel locationCode="00" code="HHE"  startDate="2020-09-05T12:00:00" endDate="2024-06-18T14:32:00" restrictedStatus="open"><Comment><Value>STATUS: RLBP national</Value><BeginEffectiveTime>2020-09-05T12:00:00Z</BeginEffectiveTime><EndEffectiveTime>2024-06-18T14:32:00Z</EndEffectiveTime><Author><Name>Observatoire de la Côte d''Azur</Name><Email>network.oca@resif.fr</Email></Author></Comment><Latitude>50.70492</Latitude><Longitude>2.24139</Longitude><Elevation>100</Elevation><Depth>0</Depth><Azimuth>90</Azimuth><Dip>0</Dip><Type>CONTINUOUS</Type><Type>GEOPHYSICAL</Type><SampleRate>100</SampleRate><Sensor><Description>TRILLIUM-120QA broad band triaxial sensor by Nanometrics</Description><Model>TRILLIUM-120QA</Model><SerialNumber>002755</SerialNumber></Sensor><DataLogger><Description>CENTAUR data acquisition system by Nanometrics</Description><Model>CENTAUR</Model><SerialNumber>2783</SerialNumber></DataLogger><Response><InstrumentSensitivity><Value>4.81e+08</Value><Frequency>1</Frequency><InputUnits><Name>m/s</Name><Description>meter per second (velocity)</Description></InputUnits><OutputUnits><Name>count</Name><Description>digital counts</Description></OutputUnits></InstrumentSensitivity></Response></Channel> 
<Channel locationCode="00" code="HHN"  startDate="2020-09-05T12:00:00" endDate="2024-06-18T14:32:00" restrictedStatus="open"><Comment><Value>STATUS: RLBP national</Value><BeginEffectiveTime>2020-09-05T12:00:00Z</BeginEffectiveTime><EndEffectiveTime>2024-06-18T14:32:00Z</EndEffectiveTime><Author><Name>Observatoire de la Côte d''Azur</Name><Email>network.oca@resif.fr</Email></Author></Comment><Latitude>50.70492</Latitude><Longitude>2.24139</Longitude><Elevation>100</Elevation><Depth>0</Depth><Azimuth>0</Azimuth><Dip>0</Dip><Type>CONTINUOUS</Type><Type>GEOPHYSICAL</Type><SampleRate>100</SampleRate><Sensor><Description>TRILLIUM-120QA broad band triaxial sensor by Nanometrics</Description><Model>TRILLIUM-120QA</Model><SerialNumber>002755</SerialNumber></Sensor><DataLogger><Description>CENTAUR data acquisition system by Nanometrics</Description><Model>CENTAUR</Model><SerialNumber>2783</SerialNumber></DataLogger><Response><InstrumentSensitivity><Value>4.81e+08</Value><Frequency>1</Frequency><InputUnits><Name>m/s</Name><Description>meter per second (velocity)</Description></InputUnits><OutputUnits><Name>count</Name><Description>digital counts</Description></OutputUnits></InstrumentSensitivity></Response></Channel> 
<Channel locationCode="00" code="HHZ"  startDate="2020-09-05T12:00:00" endDate="2024-06-18T14:32:00" restrictedStatus="open"><Comment><Value>STATUS: RLBP national</Value><BeginEffectiveTime>2020-09-05T12:00:00Z</BeginEffectiveTime><EndEffectiveTime>2024-06-18T14:32:00Z</EndEffectiveTime><Author><Name>Observatoire de la Côte d''Azur</Name><Email>network.oca@resif.fr</Email></Author></Comment><Latitude>50.70492</Latitude><Longitude>2.24139</Longitude><Elevation>100</Elevation><Depth>0</Depth><Azimuth>0</Azimuth><Dip>-90</Dip><Type>CONTINUOUS</Type><Type>GEOPHYSICAL</Type><SampleRate>100</SampleRate><Sensor><Description>TRILLIUM-120QA broad band triaxial sensor by Nanometrics</Description><Model>TRILLIUM-120QA</Model><SerialNumber>002755</SerialNumber></Sensor><DataLogger><Description>CENTAUR data acquisition system by Nanometrics</Description><Model>CENTAUR</Model><SerialNumber>2783</SerialNumber></DataLogger><Response><InstrumentSensitivity><Value>4.81e+08</Value><Frequency>1</Frequency><InputUnits><Name>m/s</Name><Description>meter per second (velocity)</Description></InputUnits><OutputUnits><Name>count</Name><Description>digital counts</Description></OutputUnits></InstrumentSensitivity></Response></Channel> 
<Channel locationCode="00" code="LHE"  startDate="2022-01-20T08:46:00" endDate="2024-06-18T14:32:00" restrictedStatus="open"><Comment><Value>STATUS: RLBP national</Value><BeginEffectiveTime>2022-01-20T08:46:00Z</BeginEffectiveTime><EndEffectiveTime>2024-06-18T14:32:00Z</EndEffectiveTime><Author><Name>Observatoire de la Côte d''Azur</Name><Email>network.oca@resif.fr</Email></Author></Comment><Latitude>50.70492</Latitude><Longitude>2.24139</Longitude><Elevation>100</Elevation><Depth>0</Depth><Azimuth>90</Azimuth><Dip>0</Dip><Type>CONTINUOUS</Type><Type>GEOPHYSICAL</Type><SampleRate>1</SampleRate><Sensor><Description>TRILLIUM-120QA broad band triaxial sensor by Nanometrics</Description><Model>TRILLIUM-120QA</Model><SerialNumber>002755</SerialNumber></Sensor><DataLogger><Description>CENTAUR data acquisition system by Nanometrics</Description><Model>CENTAUR</Model><SerialNumber>2783</SerialNumber></DataLogger><Response><InstrumentSensitivity><Value>4.81e+08</Value><Frequency>0.5</Frequency><InputUnits><Name>m/s</Name><Description>meter per second (velocity)</Description></InputUnits><OutputUnits><Name>count</Name><Description>digital counts</Description></OutputUnits></InstrumentSensitivity></Response></Channel> 
<Channel locationCode="00" code="LHN"  startDate="2022-01-20T08:46:00" endDate="2024-06-18T14:32:00" restrictedStatus="open"><Comment><Value>STATUS: RLBP national</Value><BeginEffectiveTime>2022-01-20T08:46:00Z</BeginEffectiveTime><EndEffectiveTime>2024-06-18T14:32:00Z</EndEffectiveTime><Author><Name>Observatoire de la Côte d''Azur</Name><Email>network.oca@resif.fr</Email></Author></Comment><Latitude>50.70492</Latitude><Longitude>2.24139</Longitude><Elevation>100</Elevation><Depth>0</Depth><Azimuth>0</Azimuth><Dip>0</Dip><Type>CONTINUOUS</Type><Type>GEOPHYSICAL</Type><SampleRate>1</SampleRate><Sensor><Description>TRILLIUM-120QA broad band triaxial sensor by Nanometrics</Description><Model>TRILLIUM-120QA</Model><SerialNumber>002755</SerialNumber></Sensor><DataLogger><Description>CENTAUR data acquisition system by Nanometrics</Description><Model>CENTAUR</Model><SerialNumber>2783</SerialNumber></DataLogger><Response><InstrumentSensitivity><Value>4.81e+08</Value><Frequency>0.5</Frequency><InputUnits><Name>m/s</Name><Description>meter per second (velocity)</Description></InputUnits><OutputUnits><Name>count</Name><Description>digital counts</Description></OutputUnits></InstrumentSensitivity></Response></Channel> 
<Channel locationCode="00" code="LHZ"  startDate="2022-01-20T08:46:00" endDate="2024-06-18T14:32:00" restrictedStatus="open"><Comment><Value>STATUS: RLBP national</Value><BeginEffectiveTime>2022-01-20T08:46:00Z</BeginEffectiveTime><EndEffectiveTime>2024-06-18T14:32:00Z</EndEffectiveTime><Author><Name>Observatoire de la Côte d''Azur</Name><Email>network.oca@resif.fr</Email></Author></Comment><Latitude>50.70492</Latitude><Longitude>2.24139</Longitude><Elevation>100</Elevation><Depth>0</Depth><Azimuth>0</Azimuth><Dip>-90</Dip><Type>CONTINUOUS</Type><Type>GEOPHYSICAL</Type><SampleRate>1</SampleRate><Sensor><Description>TRILLIUM-120QA broad band triaxial sensor by Nanometrics</Description><Model>TRILLIUM-120QA</Model><SerialNumber>002755</SerialNumber></Sensor><DataLogger><Description>CENTAUR data acquisition system by Nanometrics</Description><Model>CENTAUR</Model><SerialNumber>2783</SerialNumber></DataLogger><Response><InstrumentSensitivity><Value>4.81e+08</Value><Frequency>0.5</Frequency><InputUnits><Name>m/s</Name><Description>meter per second (velocity)</Description></InputUnits><OutputUnits><Name>count</Name><Description>digital counts</Description></OutputUnits></InstrumentSensitivity></Response></Channel> 
<Channel locationCode="00" code="HHE"  startDate="2024-07-18T16:00:00" endDate="2500-12-31T23:59:59" restrictedStatus="open"><Comment><Value>STATUS: RLBP national</Value><BeginEffectiveTime>2024-07-18T16:00:00Z</BeginEffectiveTime><Author><Name>Observatoire de la Côte d''Azur</Name><Email>network.oca@resif.fr</Email></Author></Comment><Latitude>50.70492</Latitude><Longitude>2.24139</Longitude><Elevation>100</Elevation><Depth>0</Depth><Azimuth>90</Azimuth><Dip>0</Dip><Type>CONTINUOUS</Type><Type>GEOPHYSICAL</Type><SampleRate>100</SampleRate><Sensor><Description>TRILLIUM-120QA broad band triaxial sensor by Nanometrics</Description><Model>TRILLIUM-120QA</Model><SerialNumber>002755</SerialNumber></Sensor><DataLogger><Description>CENTAUR data acquisition system by Nanometrics</Description><Model>CENTAUR</Model><SerialNumber>8017</SerialNumber></DataLogger><Response><InstrumentSensitivity><Value>4.81e+08</Value><Frequency>1</Frequency><InputUnits><Name>m/s</Name><Description>meter per second (velocity)</Description></InputUnits><OutputUnits><Name>count</Name><Description>digital counts</Description></OutputUnits></InstrumentSensitivity></Response></Channel> 
<Channel locationCode="00" code="HHN"  startDate="2024-07-18T16:00:00" endDate="2500-12-31T23:59:59" restrictedStatus="open"><Comment><Value>STATUS: RLBP national</Value><BeginEffectiveTime>2024-07-18T16:00:00Z</BeginEffectiveTime><Author><Name>Observatoire de la Côte d''Azur</Name><Email>network.oca@resif.fr</Email></Author></Comment><Latitude>50.70492</Latitude><Longitude>2.24139</Longitude><Elevation>100</Elevation><Depth>0</Depth><Azimuth>0</Azimuth><Dip>0</Dip><Type>CONTINUOUS</Type><Type>GEOPHYSICAL</Type><SampleRate>100</SampleRate><Sensor><Description>TRILLIUM-120QA broad band triaxial sensor by Nanometrics</Description><Model>TRILLIUM-120QA</Model><SerialNumber>002755</SerialNumber></Sensor><DataLogger><Description>CENTAUR data acquisition system by Nanometrics</Description><Model>CENTAUR</Model><SerialNumber>8017</SerialNumber></DataLogger><Response><InstrumentSensitivity><Value>4.81e+08</Value><Frequency>1</Frequency><InputUnits><Name>m/s</Name><Description>meter per second (velocity)</Description></InputUnits><OutputUnits><Name>count</Name><Description>digital counts</Description></OutputUnits></InstrumentSensitivity></Response></Channel> 
<Channel locationCode="00" code="HHZ"  startDate="2024-07-18T16:00:00" endDate="2500-12-31T23:59:59" restrictedStatus="open"><Comment><Value>STATUS: RLBP national</Value><BeginEffectiveTime>2024-07-18T16:00:00Z</BeginEffectiveTime><Author><Name>Observatoire de la Côte d''Azur</Name><Email>network.oca@resif.fr</Email></Author></Comment><Latitude>50.70492</Latitude><Longitude>2.24139</Longitude><Elevation>100</Elevation><Depth>0</Depth><Azimuth>0</Azimuth><Dip>-90</Dip><Type>CONTINUOUS</Type><Type>GEOPHYSICAL</Type><SampleRate>100</SampleRate><Sensor><Description>TRILLIUM-120QA broad band triaxial sensor by Nanometrics</Description><Model>TRILLIUM-120QA</Model><SerialNumber>002755</SerialNumber></Sensor><DataLogger><Description>CENTAUR data acquisition system by Nanometrics</Description><Model>CENTAUR</Model><SerialNumber>8017</SerialNumber></DataLogger><Response><InstrumentSensitivity><Value>4.81e+08</Value><Frequency>1</Frequency><InputUnits><Name>m/s</Name><Description>meter per second (velocity)</Description></InputUnits><OutputUnits><Name>count</Name><Description>digital counts</Description></OutputUnits></InstrumentSensitivity></Response></Channel> 
<Channel locationCode="00" code="LHE"  startDate="2024-07-18T16:00:00" endDate="2500-12-31T23:59:59" restrictedStatus="open"><Comment><Value>STATUS: RLBP national</Value><BeginEffectiveTime>2024-07-18T16:00:00Z</BeginEffectiveTime><Author><Name>Observatoire de la Côte d''Azur</Name><Email>network.oca@resif.fr</Email></Author></Comment><Latitude>50.70492</Latitude><Longitude>2.24139</Longitude><Elevation>100</Elevation><Depth>0</Depth><Azimuth>90</Azimuth><Dip>0</Dip><Type>CONTINUOUS</Type><Type>GEOPHYSICAL</Type><SampleRate>1</SampleRate><Sensor><Description>TRILLIUM-120QA broad band triaxial sensor by Nanometrics</Description><Model>TRILLIUM-120QA</Model><SerialNumber>002755</SerialNumber></Sensor><DataLogger><Description>CENTAUR data acquisition system by Nanometrics</Description><Model>CENTAUR</Model><SerialNumber>8017</SerialNumber></DataLogger><Response><InstrumentSensitivity><Value>4.81e+08</Value><Frequency>0.5</Frequency><InputUnits><Name>m/s</Name><Description>meter per second (velocity)</Description></InputUnits><OutputUnits><Name>count</Name><Description>digital counts</Description></OutputUnits></InstrumentSensitivity></Response></Channel> 
<Channel locationCode="00" code="LHN"  startDate="2024-07-18T16:00:00" endDate="2500-12-31T23:59:59" restrictedStatus="open"><Comment><Value>STATUS: RLBP national</Value><BeginEffectiveTime>2024-07-18T16:00:00Z</BeginEffectiveTime><Author><Name>Observatoire de la Côte d''Azur</Name><Email>network.oca@resif.fr</Email></Author></Comment><Latitude>50.70492</Latitude><Longitude>2.24139</Longitude><Elevation>100</Elevation><Depth>0</Depth><Azimuth>0</Azimuth><Dip>0</Dip><Type>CONTINUOUS</Type><Type>GEOPHYSICAL</Type><SampleRate>1</SampleRate><Sensor><Description>TRILLIUM-120QA broad band triaxial sensor by Nanometrics</Description><Model>TRILLIUM-120QA</Model><SerialNumber>002755</SerialNumber></Sensor><DataLogger><Description>CENTAUR data acquisition system by Nanometrics</Description><Model>CENTAUR</Model><SerialNumber>8017</SerialNumber></DataLogger><Response><InstrumentSensitivity><Value>4.81e+08</Value><Frequency>0.5</Frequency><InputUnits><Name>m/s</Name><Description>meter per second (velocity)</Description></InputUnits><OutputUnits><Name>count</Name><Description>digital counts</Description></OutputUnits></InstrumentSensitivity></Response></Channel> 
<Channel locationCode="00" code="LHZ"  startDate="2024-07-18T16:00:00" endDate="2500-12-31T23:59:59" restrictedStatus="open"><Comment><Value>STATUS: RLBP national</Value><BeginEffectiveTime>2024-07-18T16:00:00Z</BeginEffectiveTime><Author><Name>Observatoire de la Côte d''Azur</Name><Email>network.oca@resif.fr</Email></Author></Comment><Latitude>50.70492</Latitude><Longitude>2.24139</Longitude><Elevation>100</Elevation><Depth>0</Depth><Azimuth>0</Azimuth><Dip>-90</Dip><Type>CONTINUOUS</Type><Type>GEOPHYSICAL</Type><SampleRate>1</SampleRate><Sensor><Description>TRILLIUM-120QA broad band triaxial sensor by Nanometrics</Description><Model>TRILLIUM-120QA</Model><SerialNumber>002755</SerialNumber></Sensor><DataLogger><Description>CENTAUR data acquisition system by Nanometrics</Description><Model>CENTAUR</Model><SerialNumber>8017</SerialNumber></DataLogger><Response><InstrumentSensitivity><Value>4.81e+08</Value><Frequency>0.5</Frequency><InputUnits><Name>m/s</Name><Description>meter per second (velocity)</Description></InputUnits><OutputUnits><Name>count</Name><Description>digital counts</Description></OutputUnits></InstrumentSensitivity></Response></Channel> 
</Station>
</Network>
</FDSNStationXML>
