Scientists have warned that more strong eruptions are possible.
The calm follows several strong eruptions on Saturday that spewed an ash cloud 100 miles northeast to Anchorage and beyond.
Strong eruptions at the Sun's surface produce a large release of matter (plasma), which, with a speed reaching 800 1000 km/s (the solar wind), flows into interplanetary space.
However, strong eruptions of illegal poisoning associated with human-predator-prey conflicts are expected (author unpubl. data).
The stronger eruptive types are Pelean eruptions, followed by Plinian eruptions; the strongest eruptions are called "Ultra Plinian".
Therefore similar or stronger eruptions within the coming decades are highly probable.
A new period of increased activity began on 29 October 2014 with an energetic blast and sustained ash eruptions thereafter, and another strong blast occurred on 9 December 2014.
A strong solar eruption (flares) led to a coronal mass ejection, a humongous cloud of plasma, several times the size of Earth.
Arenal has been regularly active since the strong 1968 eruption that opened 3 new craters in 200-m intervals on the west flank of the volcano.
Conversely, for Marchena, marine iguanas may also have been highly impacted by a strong volcanic eruption in 1991, where lava flows continued for at least 40 days.
