The warning came just over a week after the end of the first eruption, which forced a village on the island to be evacuated.
The offshore eruption began at a depth of over 100 meters below sea level on Oct. 10 off the southern coast of El Hierro, the smallest and most westerly of the Canary Islands, a group of islands off the western coast of Africa, which are governed by Spain.
It led to the creation of a stain caused by emissions of sulphur, pumice stone and magma which extended beyond El Hierro.
Although the first eruption died down and seismic activity began to fade, it has gained momentum again in recent days with El Hierro suffering over 120 earth tremors with the strongest reaching 3.9 on the Richter scale on Sunday.
In contrast to the first eruption, there are signs that a second eruption could happen off the northern coast of El Hierro.
Experts have met with government members of the Canary Islands to discuss the new developments. Although no new measures will be taken for the moment to evacuate the population from areas closest to a possible eruption site, the authorities will maintain their close observation of the area.
"What is happening in el Hierro has a lot of questions that still need answers. The movements have been changing their location and we need to continue studying the process to find conclusions," explained volcanologist Nemesio Perez to Spain's national broadcaster RTVE.
"What we do know is that there is activity with magma and this chapter has still not been closed," he said.
I've found pumice Pumice on Florida Beaches.
Having surfed here most of my once young but now older life - from here, it still appears better than the alternative - I have always been a beach comber.
One does not find "rocks" of much consequence in Florida. (We do have coquina, which consists of shells solidified into shelves by lime/calcite etc.) and lots of sand. We certainly do not have naturally occurring volcanic rocks (at least not yet, heh heh) such as pumice, (which is lava which has solidified while still frothy - capturing the bubbles and which therefore is lighter than salt water and can float long distances.)
I've found various bits of pumice over the years, most of which I presumed to have come from places like Montserrat. However, this article's quote: "emissions of sulphur, pumice stone and magma" makes me wonder if perhaps they've drifted from farther away, such as, say, the Canary Islands. (I'm confident that a geologist or test could probably determine the source . . .) For what it's worth, which is admittedly not much.
R.C.