| "EarthScope MT - A Shocking..." |
| EarthScope MT - A Shocking Science | |
| Shane Ingate | |
| EarthScope USArray MT Manager | |
| USAAC | |
| May 16, 2006 |
| What is MT? |
| The objective of MT is to monitor time-variations of conductivity associated with deep mantle processes. | ||
| MT yields information about: | ||
| Structures | ||
| Presence of fluids and/or conductors | ||
| Imaging the electrical conductivity gives information about the subsurface that can give insight into formation, deformation, and active processes | ||
| MT measures electrical conductivity |
| Fizziks |
| Amperes law for magnetic fields | |
| GaussÕ Law for electric field | |
| Faradays Law | |
| MaxwellÕs Law |
| MT Hardware |
| More Fizziks |
| Experience with depth vs. recording time |
| Natural EM waves I |
| Natural EM waves II |
| Natural EM waves III |
| MT Data |
| MT & Seismic Data |
| Mb 5.1 San Juan Bautista, CA, 8/12/98 | |
| 10 sec of MT & seismic data | |
| Seismic are 1 Hz & 80 Hz | |
| MT is sensitive to ground motion; surface waves displace electric dipole cables and induction coils | |
| MT similarly effected by wind, cultural noise, etc | |
| 2-D Inversion |
| EarthScope MT |
| 7 permanent MT installations, coincident with ANSS backbone stations - Goal: deep mantle | |
| 20 MT installations that go with the TA (1 month in place at a time) - Goal: mid-upper mantle | |
| EMSOC MT stations available for short-term loans for PI-driven campaign research, as funding allows - Goal: lower lithosphere and crust | |
| ES MT Structure |
| A USArray Magnetotelluric Manager (Shane Ingate) will be responsible for coordination of MT activities and oversight of the portable MT program. The MT Manager will report to the IRIS President as PI for USArray. | |
| A Magnetotelluric Working Group will be established to provide advice to the MT Manager. This working group will be constituted under and report to the IRIS Coordinating Committee. | |
| ElectroMagnetic Working Group (EMWoG) |
| Members | |
| Gary Egbert (OSU) | |
| Rob Evans (WHOI) | |
| Shane Ingate (IRIS) - Liason | |
| Dean Livelybrooks (UO) | |
| Kevin Mickus (Miss State) | |
| Stephen Park (UCR) | |
| Adam Schultz (OSU) | |
| Martyn Unsworth (U. Alberta) | |
| Phil Wannamaker (UU) - Chair | |
| Observers | |
| Tim Ahern (IRIS) | |
| Kent Anderson (IRIS) | |
| Bob Busby (IRIS) | |
| Jim Fowler (IRIS) | |
| EMWoG Tasks |
| USArray Change Order #15 | ||
| Web site | ||
| Equipment selection (pre-EMWoG) | ||
| Backbone planning | ||
| Legacy Sites | ||
| Cooperation with POLARIS | ||
| Oregon pilot project | ||
| Outreach (1-pagers) | ||
| EOS paper | ||
| Future planning | ||
| MT Procurement Status |
| Procurement |
| Order for 20 NIMS systems placed Nov Ô05 | ||
| Order revised Apr 06 | ||
| ETA Autumn, Ô06 | ||
| Order for 7 NIMS systems placed Apr Ô06 | ||
| ETA Spring, Ô07 | ||
| Order total CAD$412,793 (~$363K) | ||
| Concern: Availability of suitable ring core material (5/12/06 run failed) | ||
| Backbone MT - status |
| Backbone Schedule |
| 4/30-5/5 ANMO, NM (now Hilton Ranch) | |
| 5/19-5/23 Parkfield, CA | |
| 6/5-6/9 Bull Shoals, MO | |
| 6/22-6/25 Wild Horse Valley, OR (now Soap Creek) | |
| 7/9-7/14 Conover (COWI), WI | |
| 8/27-9/1 Alum Ck State Park (ACSO), OH | |
| 9/17-9/22 Dagmar (DGMT), MT | |
| 10/15-10/27 Visit any alternative Backbone sites required | |
| 11/12-11/25 Acceptance testing newly delivered Backbone NIMS | |
| (Note: 2 systems for Backbone testing on loan from EMSOC) |
| Transportable MT - Status |
| Transportable MT - OR Pilot |
| TA Co-location MT.SPC02 and TA.H03A |
| Tests conducted at TA.H03A 8-12 May to determine influence of passive MT recording systems on TA equipment, and impact of TA telemetry and large mass/coil movements on MT. | |
| SPC02/H03A - Interactions |
| SPC02/03 - Electrode test |
| Legacy Experiments |
| Transportable Planning |
| GeoFrame workshop listed priority areas for Flex Array studies. | |
| Cascadia/Idaho bath/Yellowstone/maybe Black Hills | |
| Salton Sea/Walker Lane | |
| Mid Continent Rift/Superior area | |
| S. Appalachians/New Madrid/Reelfoot Rift. | |
| These areas will have to get broader community support through the proposal process but they may be tentative choices for MT groups of 70 km sites. |
| Fin |
| SIG |