 HOUSTON, Aug. 09, 2021 GLOBE NEWSWIRE -- ION Geophysical Corporation NYSE: IO today announced that it will release its second quarter 2021 financial results on Wednesday, August 11, 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, August 12, 2021 at 10:00 a.m. Eastern Time 9:00 a.m. Central Time. 