Icelandic volcanoes erupt as supermoon hits the sky
The term supermoon is not astronomical, but originated in modern astrology. The association of the Moon with both oceanic and crustal tides has led to claims that the supermoon phenomenon may be associated with increased risk of events such as earthquakes and volcanic eruptions. In Septermber 2014, Icelandic volcanoes started to erupt during one of the supermoon appearances.
The Moon’s distance varies each month between approximately 357,000 kilometers and 406,000 km due to its elliptical orbit around the Earth. The full moon cycle is the period between alignments of the lunar perigee with the sun and the earth, which is about 13.9443 synodic months (about 411.8 days). Thus approximately every 14th full moon will be a supermoon. However, halfway through the cycle the full moon will be close to apogee, and the new moons immediately before and after can be supermoons. Thus there may be as many as three supermoons per full moon cycle.