UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q (Mark One) ☒ Quarterly Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 for the Quarterly Period Ended December 31, 2021 OR ☐ Transition Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 for the transition period from ____ to ____ Commission file number 001-13601 GEOSPACE TECHNOLOGIES CORPORATION (Address of principal executive offices) (Zip Code) (I.R.S. Employer Identi ...