# US 7,746,077 B2 · Method for measuring the magnetotelluric response to the earth's subsurface

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- Number: US 7,746,077 B2
- Document ID: US7746077B2
- Status: Granted
- Kind: B2
- Application number: 11/742,352
- Filed: 2007-04-30
- Published: 2008-10-30
- Granted: 2010-06-29
- Earliest claimed: 2007-04-30
- Assignees: KJT Enterprises, Inc.
- Inventors: Kurt M. Strack; Stefan L. Helwig
- Web page: https://patentgrep.com/patent/US7746077B2

## CPC

- G01V 3/12: operating with electromagnetic waves {(operating with millimetre waves G01V8/005)}
- G01V 3/083: {Controlled source electromagnetic [CSEM] surveying}
- Y02A 90/30: Assessment of water resources
- G01V: GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS (means for indicating the location of accidentally buried, e.g. snow-buried, persons A63B29/02)
- Y02A: TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE

## Abstract

A method for measuring magnetotelluric response of the Earth includes measuring transient controlled source electromagnetic response of the subsurface below a body of water over a plurality of actuations of an electromagnetic transmitter. The transient response measurements are stacked. The stacked transient responses are subtracted from measurements of total electromagnetic Earth response over a time period including the plurality of transient response measurements to generate the magnetotelluric response.

## Claims

### Claim 1

A method for measuring magnetotelluric response of the Earth's subsurface, comprising:
measuring transient controlled source electromagnetic response of the Earth's subsurface below the bottom of a body of water over a plurality of actuations of an electromagnetic transmitter;
stacking the transient response measurements; and
subtracting the stacked transient response from measurements of total electromagnetic Earth response over a time period including the plurality of transient response measurements to generate the magnetotelluric response.

### Claim 2 (depends on 1)

The method of claim 1 wherein the transient controlled source electromagnetic response is produced by inducing a transient magnetic field in the Earth's subsurface.

### Claim 3 (depends on 1)

The method of claim 1 wherein the transient controlled source electromagnetic response is produced by inducing a transient electric field in the Earth's subsurface.

### Claim 4 (depends on 1)

The method of claim 1 further comprising static correcting the magnetotelluric response using the at least one of the transient response measurements and the stacked transient response measurements.

### Claim 5 (depends on 1)

The method of claim 1 further comprising jointly inverting the magnetotelluric response and the transient response measurements.