- Providing Sustainable Engineering Solutions
- Get a Quote
- Info@fluxiss.com
At Fluxiss, we’ve spent a lot of time obsessing over how energy moves through the ground. Whether you’re in New York, Dubai, or the UK, understanding what distinguishes surface and body seismic waves isn’t just academic—it’s the difference between a structure that stands and one that snaps.
When an earthquake hits, the energy doesn’t just appear at your doorstep. It travels. The first things to arrive are the body waves. Think of these as the “scouts.” They travel through the interior of the Earth, taking the shortest route possible.
We have observed in our research and in the field how the body waves vs surface waves work on a seismogram. Body waves are rapid and of high frequency. They inform the building, “Something is coming. However, since they go far under the crust and mantle of the Earth, before reaching the surface, they weakened considerably.
In the category of body waves, there are two key participants. You have most likely heard of compressional and shear waves and this is nothing more than fancy language to say P and S waves.
If body waves are the scouts, surface waves are the heavy artillery. They only travel along the ground surface, and they are much slower, but they carry a lot of energy. This is where subsurface vs surface motion becomes a critical design factor at Fluxiss.
We’ve studied enough disaster footage to know that what we call “ground rolling” is usually Rayleigh waves. They move the ground in an elliptical motion—up, back, down, and forward. It’s like being on a boat in a choppy sea.
Love waves, on the other hand, are strictly horizontal. They shift the ground from side to side at the surface. In our projects across the UK and UAE, we’ve found that Love waves are often the culprits behind foundation failures because they “wiggle” the building right off its footprint.
As of 2026, the ASCE 7-22 and 7-28 updates in the USA and the Second Generation Eurocode 8 in Europe have changed the game. We don’t just look at “peak ground acceleration” anymore. We model the seismic vibration impact on structures using multi-period design spectra.
When we design for the seismic response of piping systems, we have to account for both wave types.
If you don’t account for the structural response to Rayleigh waves, your pipeline in a city like Los Angeles or London will likely buckle during the “rolling” phase of the quake.
One thing we’ve learned from the veteran engineers here at Fluxiss is that the soil is a filter. Wave energy dissipation near surface depends entirely on whether you’re on rock or soft clay. In 2026, our soil–structure interaction modeling allows us to predict how surface waves will be amplified in “soft” cities like Dubai or New Orleans.
Feature | Body Waves (P & S) | Surface Waves (Rayleigh & Love) |
Travel Path | Deep through Earth’s interior | Along the crust/surface |
Speed | Very Fast (Scout waves) | Slower (Destructive waves) |
Frequency | High Frequency | Low Frequency |
Engineering Threat | Brittle fracture, sudden jolts | Resonance, foundation shear, rolling |
Surface and body seismic waves are different at the day’s end not only because it has a physics problem–but it is a safety mission. We consider each type of earthquake wave in engineering and geology a challenge at Fluxiss. We are not only building to code but we are building to the fact of the ground we are on. It can be the high-speed snap of a P-wave or the long-period roll of a Rayleigh wave but we are not supposed to struggle with the Earth but dance along with it.
While all waves carry risk, surface waves (specifically Love and Rayleigh waves) are the most destructive. Their large amplitude and slow decay mean they hit buildings with more energy over a longer duration. Fluxiss specializes in seismic design considerations that mitigate these specific low-frequency surface motions.
Engineers look at the difference between surface and body waves to time safety systems. P-waves are "compressional" and arrive first, triggering automatic shut-offs for gas lines. S-waves are "shear" waves that cause side-to-side shaking. We design structural joints to absorb the S-wave energy before the heavier surface waves arrive.
This is mostly due to dissipation of wave energy at the surface. Body waves diffuse energy in 3D all through the entire earth whereas surface waves are confined in 2D along the crust. This implies that they remain stronger over longer distances, which affect cities that are miles away.
Consider a P-wave (body) as the pop you can hear when a heavy truck passes your house ,it is a brief vibration. And a wave on a surface (Rayleigh) is the same as the wave over a bridge (you feel it going along when you are on the bridge). Knowledge of such kind of seismic waves and their nature will enable Fluxiss to develop stronger infrastructure globally.
We’re proudly serving clients across the USA, UK, UAE, and Europe. From corporate giants to research labs and the shipping industry,