"SAN DIEGO — Waves are getting bigger and surf at least 13 feet (about 4 meters) tall is becoming more common off California’s coast as the planet warms, according to innovative new research that tracked the increasing height from historical data gathered over the past 90 years.

Oceanographer Peter Bromirski at Scripps Institution of Oceanography used the unusual method of analyzing seismic records dating back to 1931 to measure the change in wave height.

When waves ricochet off the shore, they collide with incoming waves and cause a ripple of energy through the seafloor that can be picked up by seismographs designed to detect earthquakes. The greater the impact, the taller the wave is."

Julie Watson reports for the Associated Press August 3, 2023. [2]