FORM 4 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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(Print or Type Responses)

1. Name and Address of Reporting Person * POWERS MATTHEW R   2. Issuer Name and Ticker or Trading Symbol ION GEOPHYSICAL CORP [IO] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director _____ 10% Owner __X__ Officer (give title below) _____ Other (specify below) EVP, Gen Coun & Corp Secy (Last) (First) (Middle) 2105 CITYWEST BLVD., SUITE 100 3. Date of Earliest Transaction (Month/Day/Year) 12/01/2018 (Street) HOUSTON, TX 77042 4. If Amendment, Date Original Filed(Month/Day/Year) 6. Individual or Joint/Group Filing(Check Applicable Line) _X_ Form filed by One Reporting Person ___ Form filed by More than One Reporting Person (City) (State) (Zip) Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned

1.Title of Security (Instr. 3) 2. Transaction Date (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4) Code V Amount (A) or (D) Price Common Stock 12/01/2018   A   38,443 (1) A $ 0 53,913 D

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Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)

1. Title of Derivative Security (Instr. 3)

2. Conversion or Exercise Price of Derivative Security

3. Transaction Date (Month/Day/Year)

3A. Deemed Execution Date, if any (Month/Day/Year)

4. Transaction Code (Instr. 8)

5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4, and 5)

6. Date Exercisable and Expiration Date (Month/Day/Year)

7. Title and Amount of Underlying Securities (Instr. 3 and 4)

8. Price of Derivative Security (Instr. 5)

9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)

10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4)

11. Nature of Indirect Beneficial Ownership (Instr. 4)

Code

V

(A)

(D)

Date Exercisable

Expiration Date

Title

Amount or Number of Shares

Stock Appreciation Right

$ 8.85

12/01/2018

A

40,995

(2)

12/01/2028

Common Stock

40,995

$ 0

40,995

D

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
POWERS MATTHEW R 2105 CITYWEST BLVD., SUITE 100 HOUSTON, TX 77042			EVP, Gen Coun & Corp Secy

Signatures

Rebecca F. Sacco, attorney-in-fact		12/04/2018
**Signature of Reporting Person		Date

Explanation of Responses:

*	If the form is filed by more than one reporting person, see Instruction 4(b)(v).
**	Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
(1)	Restricted Stock award issued pursuant to the ION Geophysical Corporation Third Amended and Restated 2013 Long Term Incentive Plan. The shares of restricted stock are subject to both time-based and performance-based vesting requirements. The time-based vesting requirements provide that the shares vest in three equal installments beginning on the first anniversary of the grant date, subject to satisfaction of the performance-based vesting requirements. The performance-based vesting requirements provide that the shares vest in three equal portions upon achievement of ION common stock 20 day volume weighted average price per share targets of $17.50, $22.50 and $27.50, subject to satisfaction of the time-based vesting requirements.
(2)	Cash-settled Stock Appreciation Right ("SARs") issued pursuant to the ION Geophysical Corporation 2018 Stock Appreciation Rights Plan. The SARs are subject to both time-based and performance-based vesting requirements. The time-based vesting requirements provide that the SARs vest in three equal installments beginning on the first anniversary of the grant date, subject to satisfaction of the performance-based vesting requirements. The performance-based vesting requirements provide that the SARs vest in three equal portions upon achievement of ION common stock 20 day volume weighted average price per share targets of $17.50, $22.50 and $27.50, subject to satisfaction of the time-based vesting requirements. The maximum value of each SAR is capped at $27.50.

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