Looking at seismic noise around the Earth there is commonly a peak in the seismic noise around a frequency of 20 mHz. This peak is typically referred to as the microseism (an example is shown below). What is the source of these low frequency oscillations.

From experience I know that in southern Louisiana the motion at this peak is generally stronger throughout the winter than in the summer. I have also been told that it is associated with water waves in the gulf, but it is unclear how those waves get converted to ground motion tens of miles inland.

Looking at seismic noise around the Earth there is commonly a peak in the seismic noise around a frequency of 200 mHz. This peak is typically referred to as the microseism (an example is shown below). What is the source of these low frequency oscillations.

From experience I know that in southern Louisiana the motion at this peak is generally stronger throughout the winter than in the summer. I have also been told that it is associated with water waves in the gulf, but it is unclear how those waves get converted to ground motion tens of miles inland.