WP8 Monitoring seismicity and fluid activity near the fault using - - PowerPoint PPT Presentation

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WP8 Monitoring seismicity and fluid activity near the fault using - - PowerPoint PPT Presentation

Feb 28, 2024 209 likes •435 views

1 WP8 Monitoring seismicity and fluid activity near the fault using existing cabled and autonomous multiparameter seafloor instrumentation MARSITE KICK-OFF MEETING ISTANBUL, December, 19-20, 2012 WP8 Presentation 2 Objectives -To implement

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MARSITE KICK-OFF MEETING WP8 Presentation ISTANBUL, December, 19-20, 2012

WP8

Monitoring seismicity and fluid activity near the fault using existing cabled and autonomous multiparameter seafloor instrumentation

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MARSITE KICK-OFF MEETING WP8 Presentation ISTANBUL, December, 19-20, 2012

Objectives

  • To implement an integrated approach based on

multiparameter seafloor observatories, to continuously monitor the micro-seismicity along with the fluid expulsion activity within the submerged fault zone

  • To find robust and multiparametric methods for

implementing early warning strategies in the near future.

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MARSITE KICK-OFF MEETING WP8 Presentation ISTANBUL, December, 19-20, 2012

Scientific background (1/2)

The Marmara area corresponds to the submerged section of the North-Anatolian Fault => Necessity to deploy underwater instrumentation to improve the characterization of the near-fault seismicity

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MARSITE KICK-OFF MEETING WP8 Presentation ISTANBUL, December, 19-20, 2012

Scientific background (2/2)

1) Discovery of very characteristic tremors, 44 minutes prior to Izmit 1999 earthquake 2) Finding that gas reservoirs are connected to the Main Marmara fault zone

=> new perspectives for underwater monitoring

Are seismic tremors associated with clear anomalies in gas emission activity ? If yes, then : more criteria to evaluate the probability of occurrence of an impending earthquake

Tekirdag Siliviri

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MARSITE KICK-OFF MEETING WP8 Presentation ISTANBUL, December, 19-20, 2012

The situation of underwater monitoring in the Sea of Marmara

  • KOERI presently operates an unique network of 5 cabled,

seafloor observatories (SBOs) including : Broad-Band OBSs, accelerometer, sea bottom temperature, pressure gauge

  • European effort to collect geochemical and geophysical data

from the immediate vicinity of the fault zone, using multi- parameter, autonomous sea-floor observatories

http://www.esonet.marmara-dm.itu.edu.tr/

  • MARSITE : an unique opportunity for coordinating efforts

towards an improved, integrated monitoring of the submarine section of the NAF

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MARSITE KICK-OFF MEETING WP8 Presentation ISTANBUL, December, 19-20, 2012

Specific objectives WP8 - Task 1

Collect multi-parameter time-series through three repeated (every 6 months) sea-based cruises, using existing autonomous seafloor observatories (SN-4, piezometers, OBSs, acoustic gas bubble detectors, etc.) TL : G. Marinaro/G. Giovanetti (INGV), Participants : KOERI, IFREMER, ITU, CNR- ISMAR

  • 1. To complement KOERI’s permanent network with an additional network of

autonomous, multi-parameter seafloor observatories

  • 2. To collect geophysical and geochemical data using existing submarine equipments

(already used in the same area in previous projects) to monitor the possible interactions between fluids and seismicity

  • 3. to collect water samples through repeated oceanographic cruises:

i) to constrain the origin of the vented fluids and the possible interaction processes; ii) to the multi-parameter data sets from long-term time series

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MARSITE KICK-OFF MEETING WP8 Presentation ISTANBUL, December, 19-20, 2012

Underwater systems to be used - WP8 - Task 1 KOERI BBOBS

MEDUSA tow system

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MARSITE KICK-OFF MEETING WP8 Presentation ISTANBUL, December, 19-20, 2012

Underwater systems to be used WP8 - Task 1

SN-4 multi-parameter seafloor observatory

1 Hz Aanderaa Optode 3830 Oxygen 1 Hz Franatech METS CH4 #2 1 Hz Franatech METS CH4 #1 1 sample/10 min Wet Labs Echo-BBRTD Turbidity meter 1 sample/10 min SeaBird SBE-16plus CTD 5 Hz Nobska MAVS-3 3-C current meter 100 Hz OAS E-2PD Hydrophone 100 Hz Guralp CMG-40T Seismometer

  • Sampl. rate
  • Mfr. & model

Sensor

MEDUSA tow system degassing

Sensors:

  • 2 methane sensors
  • 1 H2S electrode
  • 1 oxygen sensor
  • 1 CTD
  • 1 trasmissometer
  • radiometer / nuclear

spectrometer

  • Altimeter
  • Deep Sea Power Cam&Light
  • Electrical cable (800 m)
  • Surface unit PC

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MARSITE KICK-OFF MEETING WP8 Presentation ISTANBUL, December, 19-20, 2012

Underwater systems to be used - WP8 - Task 1

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Piezometers OBS Gas Bubble detector

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MARSITE KICK-OFF MEETING WP8 Presentation ISTANBUL, December, 19-20, 2012

QUESTION :

  • Is the Istanbul-Silivri fault segment creeping freely ? At

what rate ?

  • Or is the fault segment blocked, accumulating elastic

deformation that may be released during a next major and damaging earthquake ?

Additional, non-contractual, specific objective within WP8 - Task 1

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MARSITE KICK-OFF MEETING WP8 Presentation ISTANBUL, December, 19-20, 2012

  • Work plan

2013 :

  • instrument integration (clinometers, compass, pressure, T…)
  • acoustic signal detection method (frequency content & waveform of the signal)
  • tests at sea : evaluation of resolution, precision, masks for diffraction, reflection
  • processing tools

2014/2015 :

  • 1st deployment of 4 PXPS : Marmara Sea (R/V Pourquoi Pas ? PI. L. Géli Ifremer)
  • Objective : Monitor Istanbul-Silivri segment of the North Anatolian Fault (NAF), south of

Istanbul

* ENV.2012.6.4-2 Long-term monitoring experiment in geologically active regions of Europe prone to natural hazards: the Supersite concept 16-FP7- ENV-2012-2-stage.

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MARSITE KICK-OFF MEETING WP8 Presentation ISTANBUL, December, 19-20, 2012

Specific objectives WP8 - Task 2

Seabed, continuous seismological monitoring and integration of multi-parameter datasets from cabled (KOERI’s) and autonomous systems (T, p, seis) TL: C. Gürbüz (KOERI), Participants: IFREMER, INGV, ITU, CNRS 1)To improve methods for the high resolution characterization of the near-fault micro- seismicity, based on KOERI’s permanent network and on autonomous stations 2)To implement specific methods to detect earthquake doublets, slow slip events and seismic tremors 3)To integrate land-based and marine-based seismic networks 4)To process the multi-parameter dataset (seismic signals, sea-bottom water pressure and temperature variations) collected by the submarine KOERI network , for analysis in Task 3

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MARSITE KICK-OFF MEETING WP8 Presentation ISTANBUL, December, 19-20, 2012

Specific objectives WP8 – Task 3

Multi-parameter data analysis TL: P. Henry (CNRS), Participants: KOERI, IFREMER, INGV, INERIS 1) To analyze time series of fluid parameters (fluid pressure in the sediment and at the seafloor, bubble flux, fluid velocity, fluid chemical composition), 2) To examine possible correlations with micro-seismicity and strain. 3) To analyze environmental data (pressure, temperature, salinity, current velocity) from the KOERI’s permanent, cabled network , to : i) correct the datasets from possible environmental effects and ii) to calibrate models of normal mode oscillations of the water column.

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MARSITE KICK-OFF MEETING WP8 Presentation ISTANBUL, December, 19-20, 2012

Specific objectives WP8 – Task 4

Prepare the next generation of seafloor observatories for geo-hazard monitoring TL: F. Italiano (INGV), Particants: KOERI, IFREMER, ITU, DAIMAR 1) To improve the existing sea-floor equipments in terms of the amount of contemporary active instruments, their interlink with “smart sensor” capacities (threshold detection, triggering) and the quality of the collected data. 2) To design, build and possibly deploy new generation components including real-time data collection systems (if logistical and budgetary conditions allow it) 3) To integrate the skills of DAIMAR company with other MARSITE partners 4) To share the collected information with the other tasks

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MARSITE KICK-OFF MEETING WP8 Presentation ISTANBUL, December, 19-20, 2012

Contractual Deliverables

D8.1) Periodic reports on repeated deployments of autonomous instruments: [Month 14, 20, 26] D8.2) Report on high-resolution micro-earthquake characterization using cabled OBS data and improved velocity, 3D model: [Month 12] D8.3) Synthesis report on spectral and statistical analysis of marine multiparameter time series: [Month 34] D8.4) Design of the next generation autonomous, multi-parameter seafloor instrumentation: [Month 30]

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MARSITE KICK-OFF MEETING WP8 Presentation ISTANBUL, December, 19-20, 2012

AGENDA

  • URANIA CRUISE in september 2013
  • MARSITECRUISE with R/V Pourquoi pas? in

2014

  • Completion of research work
  • Completion of technological/engineering work

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MARSITE KICK-OFF MEETING WP8 Presentation ISTANBUL, December, 19-20, 2012

URANIA CRUISE : MARMARA-2013

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  • 3-D kinematic studies of seismogenic faults along the NAF in the Sea of

Marmara and the Gulf of Saros (NE Aegean Sea)

  • Integrated Geophysical/Gas-geochemical studies of “hot spots”, where

gas-emission associated to active fault segments were observed (i.e., the Gulf of Izmit)

  • Deployment of seafloor observatories (SN4 and others)

URANIA (CNR, Italie)

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MARSITE KICK-OFF MEETING WP8 Presentation ISTANBUL, December, 19-20, 2012

MARSITE CRUISE LEG-1

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MARSITE KICK-OFF MEETING WP8 Presentation ISTANBUL, December, 19-20, 2012

MARSITE CRUISE LEG-1 (Zoom on Geodetic experiment)

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MARSITE KICK-OFF MEETING WP8 Presentation ISTANBUL, December, 19-20, 2012

MARSITECRUISE Proposal Sept. 2012

  • Leg2. Victor ROV planning

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MARSITE KICK-OFF MEETING WP8 Presentation ISTANBUL, December, 19-20, 2012

  • WP2 (integration with land data)
  • WP3 (land geodesy)
  • WP7 (submarine fault activity assement)

Interactions with other WPs :