MUG-OBS : une station fond de mer Géophysique Multi-paramètres

Présentation de Yann Hello (Géoazur) au Workshop "Instrumentation Géophysique" | 3-5 juillet 2017, Brissac

Transcript

1. MUG-OBS - Mul+parameter Geophysical Ocean Bo9om System . - A new instrumental approach for monitoring earthquakes. - .. mardi 25 juillet 17 RESIF Workshop - Instrumenta+on Géophysique
2. Real time cabled OBS are part of larger Observatories (Donet/Neptune), installed on
 limited sites – Installation is heavy and expensive." Câble sous-marin 2400m Coopéra+on GéoAzur, OOV, OCA, CPPM, IFREMER BroadBand Sensor is installed and burried by ROV" RESIF Workshop - Instrumentation Géophysique" mardi 25 juillet 17"
3. Real Time two Broadband Cabled seimometer in Mediterranean mardi 25 juillet 17 RESIF Workshop - Instrumenta+on Géophysique Câble sous-marin 2400m CMG3T/5T Guralp Broad Band
4. mardi 25 juillet 17" RESIF Workshop - Instrumentation Géophysique" OBS Scripps OBS GEOMAR MicrOBS Ifremer OBS – Short Term Network, few months to a year or two with no control of data quality and costly to operate in shiptime and human’s ressources" An a9empt to isolate the Broadband sensor from the chassis for a be9er coupling and response. Hippocampe-Geoazur
5. MUG is an alterna+ve to real +me observatory and short +me OBS Network. MUG-OBS is ideally suited to study subduc+on zones Once installed we control the main parameters and data quality and later using a small vessel of opportuni+es recover data within autonomous shu9les released by acous+c, DIMENSIONS 2.9m x 2.9m x 1m. Shaped to resist a trawling MATERIAL Non conduc+ve material (Syntac+c foam, Polyethylene, glass and Titanium) Dead Weight Anchor Steel with anodes Weight in Air 1.5t (3307Lb) Shu9le Buoyancy Anchor Dead Weight Seismometer well leaf spring for dynamic release mardi 25 juillet 17 RESIF Workshop - Instrumenta+on Géophysique
6. DEEP OCEAN - 6000m depth rated (19,685Ft). LONG AUTONOMY - More than 3-years Autonomy (42 month - LiSo2 ba9eries encapsulated in three containers). COST EFFECTIVE & INNOVATIVE - 6 data shu9les with acous+c release. Redundancy for data back- up in the shu9les. TIME MANAGEMENT - 1.10-8 Real Time Clock. - GPS Automa+c +me drid measurement when surfacing. Two of the six shu9les, 13” Glass spheres MUG landing at bo9om of the sea. mardi 25 juillet 17 RESIF Workshop - Instrumenta+on Géophysique
7. 6 SHUTTLES DATA COMMUNICATION Wireless Digital Induc+ve communica+on Sta+on / Shu9les TIME MANAGEMENT - 1.10-8 Real Time Clock. - GPS Automa+c +me drid measurement when surfacing. SHUTTLES LOCALIZATION -  GPS / AIS -  STROBE LIGHT DATA STORAGE -  A year DATA TRANSMISSION self-bulle+n of detected major events by Iridium. Two of the six shu9les Digital Induc+ve communica+on GPS / AIS/ Iridium/strobe light. Shu9le at release heading to the Surface. Shu9le at Surface. mardi 25 juillet 17 RESIF Workshop - Instrumenta+on Géophysique Shu9le release mechanisms
8. Acous+c communica+on and localiza+on Strobe light GPS / Iridium antenna Two acous+c containers GPS / AIS localiza+on ACOUSTIC COMMUNICATION -  2 independent channels in -  Two independent containers -  Diagnos+c (Health bulle+n) -  Distance & Posi+oning -  MUG and shu9le trigger for recovery. STATION LOCALIZATION -  GPS / AIS / Iridium -  Strobe light PROGRAMMATION & PARAMETERS CONFIGURATION -  Ethernet Web Server -  GPS & NTP -  Op+cal Cable interface for real +me applica+on. mardi 25 juillet 17 RESIF Workshop - Instrumenta+on Géophysique
9. Trillium Compact OBS Sensor release Main release Trillium Seismometer Hydrophone Absolute Pressure Sensors and communica+on SENSORS Type Sampling rate - 3-axis 120s Velocimeter Trillium 100Hz - 3-axis Accelerometer 100Hz - Broadband hydrophone 100Hz - Absolute Pressure 30s - Differen+al Pressure 100Hz - 3-Axis Magnetometer for signal Orienta+on - 2-Axis Tiltmeter on chassis. - Temperature - Humidity DATA MANAGEMENT More than 3 years (42 month) con+nuous recording on SD-Flash memories. Data format: RAW/MiniSEED/SAC DPG - Scripps mardi 25 juillet 17 RESIF Workshop - Instrumenta+on Géophysique
10. BBand seismometer – Considera+on for installa+on ROV Victor Burying Covering mardi 25 juillet 17 RESIF Workshop - Instrumenta+on Géophysique
11. New features and specifica+ons Leaf spring for dynamic release -  Main sensor is located inside a well, protected against current convec+on by top flaps and dissociated from the housing. -  Main sensor is released and ac+vated by acous+c or +mer. -  Main release is located on top of the sta+on to avoid corrosion over long term deployment. -  200 l for Buoyancy made of syntac+c foam. - Dynamic release system: 8 x 25kg leaf spring addi+onal force mardi 25 juillet 17 RESIF Workshop - Instrumenta+on Géophysique
12. Tests Campaigns November 2015 and March 2016 Câble sous-marin 2400m mardi 25 juillet 17 RESIF Workshop - Instrumenta+on Géophysique MUG_OBS 3 Years 2016 November
13. First recorded events during sea trial carried out at Villefranche sur mer - Depth 30m. 2015/11/24 at 22:45:38 “foreshock“ 7.4 magnitude and 2015/11/24 at 22:50:53 “Perou“ 7.6 magnitude pP1 sP1 P2 pP2 sP2 S MUG Ver+cal velocity Real Time CMG3T- Antares cabled OBS Ver+cal velocity TURF – Land Sta+on Ver+cal velocity 2015/11/24 complete sequence P1 mardi 25 juillet 17 RESIF Workshop - Instrumenta+on Géophysique
14. Deuxième test mardi 25 juillet 17 RESIF Workshop - Instrumenta+on Géophysique MUG Ver+cal velocity Real Time CMG3T- Antares cabled OBS Ver+cal velocity TURF – Land Sta+on Ver+cal velocity MUG Ver+cal velocity Real Time CMG3T- Antares cabled OBS Ver+cal velocity TURF – Land Sta+on Ver+cal velocity 2015/11/24 at 22:45:38 - 1st Event 2015/11/24 at 22:50:53 – 2nd Event Details of the two events Perrou 2015/11/24