based on the records,did any of the volcanoes present have activity in the past 20 years?
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Answer:
The Global Volcanism Program does not see any evidence that volcanic activity is actually increasing. Data about eruptions has been compiled by the Smithsonian since 1968 in order to provide context for global volcanism. The following figures and discussion are modified from an introductory section in Siebert et al. (2010); data is through 2009, but more recent data is available. Please do not reproduce the figures below without all of the accompanying analysis and proper citation (links are preferred). There is great value in knowing the recent volcanological record, but its limitations are not always apparent. Readers are strongly cautioned against mistaking the record for the reality.
The last 200 years of the volcanological record (figure 1), with humans distributed over most of the globe and relatively efficient communications, would seem to be the well-suited to search for episodic trends. However, even in the last two centuries any real trends are overshadowed by reporting factors such as historical events, technological changes, and exploration influences. The apparent increase in activity reflects increases in populations living near volcanoes to observe eruptions and improvements in communication technologies to report those eruptions. The best evidence that these trends are apparent rather than real comes from the record of large eruptions, whose effects are far reaching and less likely to escape documentation even in remote areas. Their constancy over the past two centuries is a better indicator of the global frequency of eruptions than the improved reporting of smaller eruptions.
Figure 1. Graph showing the number of volcanoes reported to have been active each year since 1800 CE. Total number of volcanoes with reported eruptions per year (thin upper black line) and 10-year running mean of same data (thick upper red line). Lower lines show only the annual number of volcanoes producing large eruptions (>= 0.1 km3 of tephra or magma) and scale is enlarged on the right axis; thick red lower line again shows 10-year running mean. See text for discussion.
based on the records,did any of the volcanoes present have activity in the past 20 years?
Kilauea, located on Hawaii’s Big Island, is one of the world’s most active volcanoes.
It had a major eruption in 2018 that destroyed more than 700 homes and displaced thousands of residents.
Before that eruption, the volcano had been slowly erupting for decades, but mostly not in densely populated residential areas.
Officials said the most recent eruption does not pose a threat to homes and is entirely contained within Hawaii Volcanoes National Park.