LEADERS IN SHEAR-WAVE TECHNOLOGIES

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In 2001, Prof. John Louie (Terēan’s Chief Geophysicist) invented the Refraction Microtremor method, which serves as the foundation of our seismic imaging solutions. With Prof. Louie leading our science, you can expect proven methods backed by decades of expertise.

Depth to Bedrock.

The vertical distance from the surface to solid rock is critical for engineering, mining, and construction. VsSurf ReMi® provides fast, cost-effective mapping that delivers data for foundation stability, groundwater flow, and excavation planning.
Mapping Liquefaction Potential.

ReMi® is recognized for its superior ability to detect low velocity zones (LVZ) beneath more competent material. Detailed seismic imaging tied to CPT data reveals liquefaction risks, giving engineers fast, cost-effective insights for safer designs.
Imaging Potential Faults.

Map subsurface discontinuities to guide targeted trenching and reduce excavation costs. Non-invasive fault imaging improves safety and supports informed design decisions.
Rippability.

ASCE-published shear-wave parameters classify rippable, marginal, and non-rippable zones. This guides drilling and excavation programs while reducing unnecessary blasting and wear on equipment.
Tie to Boreholes.

Tie continuous 2D velocity sections directly to borehole and CPT data. This reduces drilling, validates subsurface conditions, and increases confidence in design. Image provided by Geocon.
Deep ReMi.

Image depths beyond 1,000 ft (300 m) for mineral exploration and water resource investigations. Deep ReMi® reduces drilling costs while providing critical subsurface insight for sustainable development.

ASCE 7-22 requires Site Class to be determined from shear-wave velocity (Vs) in the upper 100 ft.

Our products meet all requirements of ASCE/SEI 7-22 Seismic Design (Chapters 11 - 23)

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Quick and Easy to Use

Our solutions give every user the ability to obtain geologic and geophysical subsurface information for geotechnics, engineering, and geotechnical engineering applications, then autogenerate a report with an accurate and ASCE 7-22 compliant seismic site classification in less than 30 minutes. The analysis is conceptually simple - you can train your field crews and leave the field knowing you have a result that is accepted by building authorities around the world.

"The results from the last job I did turned out great – the Vs100 came within 3 ft/s of seismic CPT down to 100 feet."

Tyler Bernius, PE | Senior Engineer - Intertek-PSI

Aerial view of a construction site with a blue tower crane, partially built structure, and building materials scattered around. Nearby roads and a parked vehicle are visible.

Methods accepted in both industry and academia

VsSurf® ReMi® software enables small and large institutions to give their students the practical training that the industry demands while facilitating research projects. VsSurf analyses are backed by hundreds of peer-reviewed publications.

"ReMi is my go-to method for shear wave velocity to 100'+ (usually 300'+) even above DHS, CHS, SCPT and refraction surveys…Many thanks for your white papers and expert support thru the decades!"

Ryan Coggins, P.E. | Senior Geotechnical Engineer - KIEWIT ENGINEERING GROUP, INC.

Busy urban street with taxis, vans, and buses

Perform non-intrusive surveys in traffic-heavy urban areas

VsSurf® software gives users a ground investigation method that is proven to work in traffic-heavy urban areas. Ideal for real-world geotechnical and engineering services. Find the depth to interfaces, profile landslide blocks, assess aquifer volume, and evaluate rippability at the noisiest sites.

“Let me start by saying that the VsSurf software is very user-friendly! Secondly, the training and support that comes with VsSurf is unmatched! Alison is definitely focused on making sure that the client is familiar and knowledgeable with both the software, and the field equipment used to obtain the data. The expertise of the Terēan Team is simply amazing!”

SAM ABDOLLAHIAN, PHD, P.E. | Geotechnical Department Manager - ECS SOUTHEAST, LLC

Construction site with purple pipes and worker in safety vest

Work with a variety of data

VsSurf® software works with geophone arrays, DAS fibers, small and large scale recording setups, and both interferometric and non-interferometric data.

“We consider the project-specific measurement of Vs an integral part of our geotechnical site characterization for seismic applications and look forward to continuing interaction with Dr. Louie and Terēan.”

Stephen E. Dickenson, Ph.D., P.E., B.C. PE | Principal Engineer - New Albion Geotechnical, Inc.

Geotechnics

Reliably and quickly determine critical subsurface information for less; such as earthquake ground shaking potential per the International Building Code (IBC), depth and velocity of subsurface layers, and rheologic properties of earth & rock.
Engineering

Confidently and independently evaluate the depth, lateral extent, and rheologic properties of subsurface soil and rock layers. Constrain the location of faults and slides and determine the effectiveness of compaction and earth remediation projects.
Mining

Reduce costs by covering your mineral resource ground reliably and rapidly to understand depth to bedrock, locate faults, estimate excavation and hauling costs, constrain the location of ore & waste rock zones, and monitor earthen structures; such as tailings retention dams.
Energy

Non-invasively image basin-wide earth structure to over 10,000 feet (3,200 m) depth, to assist in developing drill targets for producing energy resources in commercial quantities.
Research

State-of-the-art seismic data processing software for research, teaching, and collaboration on a local or planetary exploration scale.