CGG

Report Publication Announcement • Aug 1, 2013

CGG Announces Availability of the Interim Financial Report for the Period ending June 30, 2013

CGG

Société Anonyme with a share capital of €70,744,354 Registered office: Tour Maine Montparnasse, 33 avenue du Maine, 75015 Paris No.: 969 202 241 – RCS Paris

PARIS, France – August 1, 2013

CGG announced today that its interim report for the period ending June 30, 2013 and its Form 6-K for the second quarter and first half of 2013 were filed with the Autorité des Marchés Financiers (AMF) and the SEC on August 1, 2013 respectively.

Both documents are available on the Company's website (www.cgg.com) under the Investors/Financial Reports section.

A printed copy of these documents is available upon request, free of charge, if you call our Investor Relations Department at: +33 1 64 47 38 31, or send an email to invrelparis@cgg.com or write to: CGG – Investor Relations Department – Tour Maine Montparnasse, 33 avenue du Maine, 75015 Paris, France.

About CGG

CGG (www.cgg.com) is a fully integrated Geoscience company providing leading geological, geophysical and reservoir capabilities to its broad base of customers primarily from the global oil and gas industry. Through its three complementary business divisions of Equipment, Acquisition and Geology, Geophysics & Reservoir (GGR), CGG brings value across all aspects of natural resource exploration and exploitation. CGG employs over 9,800 people around the world, all with a Passion for Geoscience and working together to deliver the best solutions to its customers.

CGG is listed on the Euronext Paris SA (ISIN: 0000120164) and the New York Stock Exchange (in the form of American Depositary Shares. NYSE: CGG).

Investor Relations Contact Christophe Barnini Tel: +33 1 64 47 38 11 E-Mail: invrelparis@cgg.com