Sentence examples for precursory activities from inspiring English sources

Although forecasting an occurrence of phreatic eruption is very difficult, it has been reported that some precursory activities often precede these eruptions at several volcanoes.

Barberi et al. (1992) compiled the precursory activities of phreatic eruptions reported in scientific papers and found that almost two thirds of the compiled events accompanied some sort of precursory variation in seismicity and in the chemical components of underground water.

Other than the increased heat flow, few anomalies were recorded during the geophysical surveys, nor were any other precursory activities observed that would indicate that magma was moving up into the volcano.

Early detection of precursory activity is therefore critical.

Rostoker (1968) noted such precursory activity in auroral zone magnetic bays and auroral and subauroral Pi 2 records, calling the precursory activity a "trigger bay".

Among the precursory activity, ground inflation detected by campaign GPS observations was significant.

On 27 September 2014, Ontake volcano, in central Japan, suddenly erupted without precursory activity.

Searching for non-linear strain prior to a seismic rupture is of importance in the issue of precursory activity.