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 March 31, 2019 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 (Exact Name of Registrant as Specified in Its Charter) Texas 76-0447780 ( Stat ...

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q [X] Quarterly Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 for the Quarterly Period Ended December 31, 2018 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 (Exact Name of Registrant as Specified in Its Charter) Texas 76-0447780 (State or ...