If waves suddenly grow to around a meter in height without the presence of strong wind or seismic activity, there could be several possible explanations. Here are a few potential factors that can lead to the growth of waves under such conditions:
Underwater geological features: Submerged geological formations, such as reefs or shoals, can cause waves to break and increase in height unexpectedly. These formations can disrupt the regular pattern of wave propagation and result in localized wave amplification.
Tide or current interactions: The interaction between tidal currents and wave action can create localized wave growth. When tidal currents flow against incoming waves, they can cause the waves to steepen and increase in height.
Seafloor topography: Changes in seafloor topography, such as sudden depth variations or the presence of underwater canyons, can cause waves to grow. As waves encounter these irregularities, they can refract, converge, or undergo constructive interference, leading to larger wave heights.
Wave interference: When two or more wave systems meet, interference can occur, resulting in wave amplification. This can happen if two wave systems with similar or slightly different frequencies intersect, causing constructive interference and wave height increase.
Underwater disturbances: Sometimes, underwater disturbances such as the movement of marine animals, water currents, or turbulence caused by temperature or salinity gradients can locally affect the wave dynamics and cause wave growth.
It's important to note that even if wind or seismic activity may not be noticeable to you, there could still be subtle environmental factors at play that are responsible for the wave amplification. Additionally, localized weather or atmospheric conditions that aren't immediately apparent could contribute to the phenomenon.
If you witnessed this event personally and are curious about the specific circumstances surrounding it, it would be advisable to consult local experts or authorities who can provide more accurate information based on detailed knowledge of the area and the incident.