Which of the following can indicate that a stronger earthquake may soon occur?

The occurrence of micro-earthquakes, which are small tremors that might not be felt by people, can be a significant indicator that a stronger earthquake is on the horizon. These small earthquakes usually happen in the same area where a larger quake is anticipated, suggesting that stress is building in the Earth's crust. This phenomenon is often monitored by seismologists, as an increase in micro-earthquake activity can provide valuable information about the potential for larger seismic events due to accumulated pressure along fault lines.

The other options, such as increased rainfall, rising temperatures, or changes in wind patterns, do not have a scientifically established relationship with the likelihood of upcoming earthquakes. While weather phenomena can affect geological processes in some ways, they do not serve as reliable predictors of seismic activity in the same manner that micro-earthquake activity does. Instead, seismic data and the analysis of tectonic plates are the primary methods for predicting potential earthquakes.