新华网苏瓦５月２４日电（记者刘鹏）努库阿洛法消息：美国地质勘探局消息显示，南太平洋岛国汤加附近海域２４日晨发生７．４级地震，目前尚无人员伤亡和财产损失的报告。
这次地震发生在当地时间２４日６时１９分（北京时间２４日１时１９分），震中位于汤加首都努库阿洛法西南方向２８７公里，震源深度１７１．４公里。
太平洋海啸预警中心没有针对这次地震发布海啸预警。
汤加位于环太平洋火山地震带，因地壳板块相互碰撞而地震频发。
汤加以西海域发生6.6级地震 震源深度100公里
中新网5月24日电 据中国地震台网测定，北京时间2013年5月24日5时7分在汤加以西海域(南纬20.5,西经175.7)发生6.6级地震， 震源深度100公里。
Strong quake strikes off Tonga
SYDNEY (AFP) – A 7.4-magnitude earthquake struck 255 kilometres (158 miles) southwest of Tonga on Friday, according to the US Geological Survey, but there were no reports of damage.
The quake hit at 5:19 am (1719 GMT Thursday), and was centred 282 kilometres southwest of Tonga’s capital Nuku’alofa and 171 kilometres deep.
It was followed four hours later by a second powerful 6.6 tremor 84 kilometres northwest of the town and 103 kilometres deep.
“A destructive tsunami was not generated based on earthquake and historical tsunami data,” the Pacific Tsunami Warning Center said of each quake.
The Matangi Tonga website said the quakes “shook homes and rattled windows” in Nuku’alofa but reported no damage.
The powerful tremors also caused false alarms in New Zealand where the official GNS Science monitoring system reported tremors of 6.1 and 5.9 magnitude off the east coast of the North Island.
A GNS spokesman said the New Zealand measuring devices had picked up the quakes from outside their network and tried to locate them and automatically sent out alerts, which were later deleted.
The two quakes off Tonga came 12 days after a similar 6.5-magnitude earthquake struck near the pacific nation at a depth of 205 kilometres.
Tonga, almost 2,000 kilometres (1,240 miles) northeast of New Zealand, lies on the so-called “Ring of Fire”, where continental plates collide causing frequent seismic activity.