 HOUSTON, May 03, 2021 GLOBE NEWSWIRE -- ION Geophysical Corporation NYSE: IO today announced that it will release its first quarter 2021 financial results on Wednesday, May 5, 2021 after the market closes. In conjunction with the release, ION has scheduled a conference call, which will be broadcast live over the Internet, on Thursday, May 6, 2021 at 10:00 a.m. Eastern Time 9:00 a.m. Central Time. 