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A crew member on a Gulf of Mexico oil rig contracted by Chevron Corp was killed in an accident, the company said on Tuesday.

A crew member on a Gulf of Mexico oil rig contracted by Chevron Corp was killed in an accident, the company said on Tuesday.

7 oil workers found alive in Gulf of Mexico.

Mexico searches for 7 missing in boating accident.

Speedboats and Kalashnikovs: Pirates Attack Oil Platforms in Mexico.

Pirates Rob Fishermen in Mexico and Leave Them Adrift.

Ferry Blast Injures 25 Passengers in Mexico.

Mexican pirates posing greater risk in Gulf of Mexico to oil workers, tourists.

Tug Sinks in Gulf of Mexico.

Two Injured in Gulf of Mexico Platform Fire.

Watch: Two Cruise Ships Collide At Mexico Port, Video Goes Viral.

Chronic low-frequency noise from commercial shipping is a worldwide threat to marine animals that rely on sound for essential life functions. Although the U.S. National Oceanic and Atmospheric Administration recognizes the potential negative impacts of shipping noise in marine environments, there are currently no standard metrics to monitor and quantify shipping noise in U.S. marine waters. However, one-third octave band acoustic measurements centered at 63 and 125 Hz are used as international (European Union Marine Strategy Framework Directive) indicators for underwater ambient noise levels driven by shipping activity. We apply these metrics to passive acoustic monitoring data collected over 20 months in 2016-2017 at five dispersed sites throughout the U.S. Exclusive Economic Zone: Alaskan Arctic, Hawaii, Gulf of Mexico, Northeast Canyons and Seamounts Marine National Monument (Northwest Atlantic), and Cordell Bank National Marine Sanctuary (Northeast Pacific). To verify the relationship between shipping activity and underwater sound levels, vessel movement data from the Automatic Identification System (AIS) were paired to each passive acoustic monitoring site. Daily average sound levels were consistently near to or higher than 100 dB re 1 μPa in both the 63 and 125 Hz one-third octave bands at sites with high levels of shipping traffic (Gulf of Mexico, Northeast Canyons and Seamounts, and Cordell Bank). Where cargo vessels were less common (the Arctic and Hawaii), daily average sound levels were comparatively lower. Specifically, sound levels were ∼20 dB lower year-round in Hawaii and ∼10-20 dB lower in the Alaskan Arctic, depending on the season. Although these band-level measurements can only generally facilitate differentiation of sound sources, these results demonstrate that international acoustic indicators of commercial shipping can be applied to data collected in U.S. waters as a unified metric to approximate the influence of shipping as a driver of

Cruise line giants like Carnival and Royal Caribbean agree to open a dialog to protect the hundreds of whale sharks that gather off Mexico each year.

Cruise line giants like Carnival and Royal Caribbean agree to open a dialog to protect the hundreds of whale sharks that gather off Mexico each year.

Fishing boat missing off Mexico; at least 4 dead.

BUENOS AIRES - President Trump and his Mexican and Canadian counterparts sought to put the acrimony of the past two years behind them on Friday as they signed a new trade agreement governing hundreds of billions of dollars in commerce that underpins their mutually dependent economies. Meeting for the first time since the revised North…

Coast Guard: 23 adrift for days rescued in Gulf of Mexico.

Ship Blocked From Jamaica and Cayman Islands Allowed to Dock in Mexico.

All 31 crew members were evacuated and there were no reported casualties, according to the company.