The death toll has soared to 920 following Venezuela’s worst earthquake in more than a century.

Local officials say 3360 injured and thousands remain unaccounted for. Crews are searching for more people trapped under the rubble.

International rescue teams have joined the search for survivors and are bringing machinery and supplies. Eighty Swiss rescuers and a team of Mexican aid workers are among those helping.

Two quakes, with magnitudes of 7.2 and 7.5, hit a minute apart on Wednesday local time, and the second was the strongest to hit Venezuela since 1900.

Members of a religious organisation distribute food. Photo: AAP

Volunteer searchers and the relatives of the many missing expressed exasperation and anger at what they describe as a lack of an official response.

CNN says some residents are calling for civilian volunteers to help clear debris, saying the emergency response is insufficient.

Doctors say chronic underfunding has left the healthcare system unequipped to treat the surge of patients.

But interim president, Delcy Rodríguez, has vowed to fight to save “as many people as possible”.

Speaking during a tour of La Guaira, the most devastated region, Rodríguez said, “We offer our solidarity [to families of victims].”

A doctor in La Guaira says the two main hospitals in the state are “completely overwhelmed”, with a “critical lack” of medical supplies.

Residents of La Guaira sit near their destroyed homes. Photo: AAP

The president surveyed the ruins of an eight-floor seafront hotel that had been obliterated by twin 7.2- and 7.5-magnitude quakes.

The US military is on the ground for rescue efforts in Venezuela — where, earlier this year, special forces conducted a deadly raid to seize then-President Nicolás Maduro.

Venezuelan forces are carrying out search operations with percussion equipment that allows for controlled breaking of concrete.

But constant aftershocks and a lack of heavy machinery are slowing operations in critical areas.

The government said it has established a stockpile centre of food, water and medicines at the Foreign Ministry in Caracas.