Company lists · Data refreshed September 2026

Top 25 Seismic engineering staffing companies worldwide

RevenueBase identified 5,677 seismic engineering staffing companies worldwide as of September 2026 and tracks 77,069 professional contacts across them, including 23,786 with verified work emails. The United States is the largest market and Houston the largest hub.

This list covers seismic engineering staffing companies worldwide, matched on what each company actually does as described in its own words. Ranked by team size, largest first. Every row shows the company's own description, its RevenueBase Smart Search rating, and when it was last checked. Data refreshed September 29, 2026. Country and city lists for seismic engineering staffing companies follow the table.

Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase Smart Search, the natural-language company search RevenueBase customers use to build their own targeted lists and unlock verified emails and direct dials at the companies on them. How these lists are built and judged.

How to read this list HQ checked on every row RevenueBase Smart Search rating on every row Refreshed Sep 29, 2026 86% judged on-target in blind review
5,677Companies
77,069Contacts tracked
23,786Verified emails
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The 25 largest seismic engineering staffing companies worldwide

Ranked by team size
Top 25 of 5,677 seismic engineering staffing companies worldwide, ranked by team size, largest first. Data refreshed Sep 29, 2026. RevenueBase Smart Search rates how each company's information relates to seismic engineering staffing companies: strong evidence (its own description names it), partial (names part of it), indirect (matched on the rest of its profile rather than the description shown). Click a contact count to view that company's people.
#CompanyRevenueBase Smart SearchHeadquartersEmployeesContacts
1Partial evidenceOlathe, KS, United StatesHQ checked Sep 29, 20265,001-10,0006,113 contacts →

Partial evidence

“Terracon is a 100 percent employee-owned consulting engineering firm providing quality services to clients.”

Source: RevenueBase Database · checked Sep 29, 2026
2Partial evidenceRound Rock, TX, United StatesHQ checked Sep 29, 2026501-1,0001,234 contacts →

Partial evidence

“Let us make construction staffing work for you.”

Source: RevenueBase Database · checked Sep 29, 2026
3Strong evidenceGreenville, United StatesHQ checked Sep 29, 2026201-5001,187 contacts →

Strong evidence

“TRS Staffing Solutions is a world leading engineering recruitment agency specialising in the recruitment and supply of professional, engineering, technical and field talent.”

Source: RevenueBase Database · checked Sep 29, 2026
4Indirect evidenceNorwood, MA, United StatesHQ checked Sep 29, 2026501-1,000880 contacts →

Indirect evidence

“Founded in 1964 as a soils and foundations specialty consultant, GZA GeoEnvironmental, Inc.(GZA) has grown into a full-service company providing its clients with highly…”

Source: RevenueBase Database · checked Sep 29, 2026
5Partial evidenceVancouver, BC, CanadaHQ checked Sep 29, 2026501-1,000798 contacts →

Partial evidence

“BGC Engineering is an international consulting firm that provides professional services in applied earth sciences.”

Source: RevenueBase Database · checked Sep 29, 2026
6Partial evidenceUnited KingdomHQ checked Sep 29, 20261,001-5,000726 contacts →

Partial evidence

“NES Global Talent provided engineering and technical personnel to the Oil & Gas, Power, Life Science and mining sectors.”

Source: RevenueBase Database · checked Sep 29, 2026
7Indirect evidenceGlen Allen, VA, United StatesHQ checked Sep 29, 2026501-1,000707 contacts →

Indirect evidence

“Schnabel is a trusted partner in building the foundation for project success.”

Source: RevenueBase Database · checked Sep 29, 2026
8Strong evidenceWarrington, United KingdomHQ checked Sep 29, 2026501-1,000589 contacts →

Strong evidence

“Fircroft is now part of the NES Fircroft group - the world’s leading engineering staffing provider spanning the Oil & Gas, Power & Renewables, Infrastructure, Life Sciences…”

Source: RevenueBase Database · checked Sep 29, 2026
9Indirect evidenceOrange, CA, United StatesHQ checked Sep 29, 20265,001-10,000584 contacts →

Indirect evidence

“A Six Sigma Company ~61 years in the industry ~Nationwide 4 million+ candidate database ~Fortune Company ~Extensive E-Recruiting capabilities ~Reference and Employment check…”

Source: RevenueBase Database · checked Sep 29, 2026
10Indirect evidenceSan Antonio, TX, United StatesHQ checked Sep 29, 2026501-1,000582 contacts →

Indirect evidence

“Founded in 1968, Raba Kistner Inc.”

Source: RevenueBase Database · checked Sep 29, 2026
11Partial evidenceBengaluru, IndiaHQ checked Sep 29, 20261,001-5,000535 contacts →

Partial evidence

“Ven India - Your Resource Augmentation Success Partner Empowering Industries with Skilled Engineering Talent Since 2010 At VEN India, we specialize in engineering resource…”

Source: RevenueBase Database · checked Sep 29, 2026
12Indirect evidenceHouston, TX, United StatesHQ checked Sep 29, 2026201-500521 contacts →

Indirect evidence

“SAExploration offers a full range of geophysical ground acquisition services from design, prospecting, drilling, recording and analysis of field quality, as well as mobilization…”

Source: RevenueBase Database · checked Sep 29, 2026
13Indirect evidenceChelmsford, United KingdomHQ checked Sep 29, 2026501-1,000506 contacts →

Indirect evidence

“Waterman Aspen welcomes engineers and technical specialists to make their mark on some of the biggest infrastructure projects across the UK on a secondment basis.”

Source: RevenueBase Database · checked Sep 29, 2026
14Indirect evidenceKalamazoo, MI, United StatesHQ checked Sep 29, 2026201-500494 contacts →

Indirect evidence

“Trillium Construction Services has over a quarter of a century of experience in the construction recruiting industry.”

Source: RevenueBase Database · checked Sep 29, 2026
15Indirect evidenceEdmonton, AB, CanadaHQ checked Sep 29, 2026501-1,000480 contacts →

Indirect evidence

Source: RevenueBase Database · checked Sep 29, 2026
16Indirect evidenceRedmond, WA, United StatesHQ checked Sep 29, 2026201-500479 contacts →

Indirect evidence

Source: RevenueBase Database · checked Sep 29, 2026
17Partial evidenceBurlington, MA, United StatesHQ checked Sep 29, 2026201-500468 contacts →

Partial evidence

“For the last sixty years Entegee has provided Fortune 500 and other companies with highly qualified engineering and technical personnel.”

Source: RevenueBase Database · checked Sep 29, 2026
18Indirect evidenceAbingdon, MD, United KingdomHQ checked Sep 29, 2026501-1,000460 contacts →

Indirect evidence

“Geo-Technology Associates, Inc.(GTA) proudly celebrates more than 40 years of service, backed by a team of 600+ professionals-including geotechnical engineers, environmental…”

Source: RevenueBase Database · checked Sep 29, 2026
19Strong evidenceWestchester, IL, United StatesHQ checked Sep 29, 2026501-1,000402 contacts →

Strong evidence

“Sterling is an award-winning professional engineering consulting and technical staffing company.”

Source: RevenueBase Database · checked Sep 29, 2026
20Indirect evidenceBelo Horizonte, BrazilHQ checked Sep 29, 2026501-1,000400 contacts →

Indirect evidence

“Fundada em 1981, a empresa é focada na execução de serviços especiais de geologia, engenharia geotécnica e recuperação de estruturas.”

Source: RevenueBase Database · checked Sep 29, 2026
21Indirect evidenceOrlando, FL, United StatesHQ checked Sep 29, 2026201-500311 contacts →

Indirect evidence

“Ardaman & Associates, Inc.”

Source: RevenueBase Database · checked Sep 29, 2026
22Indirect evidenceToruń, PolandHQ checked Sep 29, 20261,001-5,000310 contacts →

Indirect evidence

“We deliver innovative geophysical, geological and geotechnical solutions for energy sector as well as renewable energy in Poland and worldwide.”

Source: RevenueBase Database · checked Sep 29, 2026
23Partial evidenceAnnapolis Junction, MD, United StatesHQ checked Sep 29, 2026201-500299 contacts →

Partial evidence

“Hillis-Carnes Engineering Associates, Inc.(HCEA) is a Mid-Atlantic based, multi-disciplined consulting engineering firm.”

Source: RevenueBase Database · checked Sep 29, 2026
24Indirect evidenceBelo Horizonte, BrazilHQ checked Sep 29, 2026201-500286 contacts →

Indirect evidence

“Somos a BVP Geotecnia e Hidrotecnia.”

Source: RevenueBase Database · checked Sep 29, 2026
25Indirect evidenceSan Ramon, CA, United StatesHQ checked Sep 29, 2026201-500282 contacts →

Indirect evidence

“ENGEO Incorporated is an award-winning, employee-owned comprehensive provider of more than 400 geotechnical and civil engineers, geologists, GIS experts, environmental scientists…”

Source: RevenueBase Database · checked Sep 29, 2026

Showing 25 of 5,677 seismic engineering staffing companies worldwide

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Seismic engineering staffing companies worldwide at a glance

As of Sep 29, 2026
30.9%Verified-email coverage
13.6Average contacts per company
1-10Median size (employees)
0.9%Largest-city concentration · Houston
Sep 29, 2026Page data refreshed

Companies by employee count

1-10
3,028
11-50
1,791
51-200
630
201-500
131
501-1,000
41
1,001-5,000
25
5,001-10,000
5
10001+
4

Email recency is reported on each country list linked below.

How this list was built

Company categories are rarely black and white. RevenueBase reads each company's own description of its business to decide whether it belongs among seismic engineering staffing companies, so some rows will be adjacent to the category rather than pure plays. The description and RevenueBase Smart Search rating on every row are there so you can check each match yourself.

Source
The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase Smart Search, the natural-language company search available to every RevenueBase user.
Coverage
Every country. Country and city lists for seismic engineering staffing companies are linked below.
What qualifies
Companies worldwide whose own description of what they do matches “seismic engineering staffing companies”. Matching reads each company's description, not its industry code or its name.
RevenueBase Smart Search
RevenueBase Smart Search is how this list is assembled and how each row is rated. RevenueBase's data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to a category defined in a user's own words. Each row is rated strong evidence (its own description names seismic engineering staffing companies), partial evidence (it names part of the category) or indirect evidence (the description shown names none of it and the match rests on the rest of the company's profile). The description supporting each rating is quoted on the row.
What we exclude
Companies whose own description does not clearly place them among seismic engineering staffing companies, and records with no verified work email.
Match quality
In blind human judging of this matching method, 86% of matched companies were on target. Expect roughly 1 in 7 rows to be adjacent to the category rather than a pure play. Every row shows the company's own description and its RevenueBase Smart Search rating so you can judge each match yourself. Read the full methodology: how the lists are built, how the judging worked, and what the figure means.
Ranking
Team size, largest first: companies are ordered by the number of professionals RevenueBase tracks at each one. Employee ranges shown are reported bands, for context.
Verification
Every listed company carries at least one verified work email, 23,786 across the full list. Contacts re-verify on a rolling cadence, and each contact's own verification date is shown inside RevenueBase.
Refresh
This page's figures were pulled from the company graph on September 29, 2026. Lists refresh periodically as the graph is re-checked.
Corrections
Wrong category, wrong headquarters, or a company that has closed? Use “Report an issue” on any row. Reports go to the RevenueBase Data Team and feed back into the company graph.

Seismic engineering staffing companies by location

31 lists · largest first

Every Seismic engineering staffing companies list RevenueBase publishes, by country and city. Counts are matching companies in each list as of its own refresh date.

Countries

Cities

Frequently asked

What is RevenueBase Smart Search?

RevenueBase Smart Search is how RevenueBase decides which companies belong on this list and how strongly each one fits. Its data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to the category the list is about. Each row is rated strong evidence when the company's own description names seismic engineering staffing companies, partial evidence when it names part of the category, and indirect evidence when the description shown names none of it and the match rests on the rest of the company's profile.

How many seismic engineering staffing companies are there worldwide?

RevenueBase identified 5,677 seismic engineering staffing companies worldwide as of September 2026, matched on each company's own description of what it does rather than its industry code.

What is the largest company on this list?

Terracon, headquartered in Olathe, tops this list with the largest team on record.

Which country has the most seismic engineering staffing companies?

The United States leads with 1,524 companies, followed by Italy (309) and Canada (260). Every seismic engineering staffing companies list by country and city is linked on this page.

Which city has the most seismic engineering staffing companies?

Houston leads with 53 headquartered companies, followed by Sao Paulo (53) and London (49).

How do I get contact information for these companies?

A free RevenueBase account lets you run this exact search and work the top results, verified emails and direct dials included. Upgrading unlocks all 23,786 verified decision-maker contacts tracked across these 5,677 companies.

How current is this list?

The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on September 29, 2026.

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About this data

RevenueBase is a B2B data infrastructure company. Its company graph covers 60 million companies and 398.9 million professional contacts, with emails verified on a rolling cadence rather than scraped once and left to decay. These company lists are generated directly from that graph with RevenueBase Smart Search, the same natural-language company search every RevenueBase user has: describe a market in plain words, get the companies that match, and add verified emails and direct dials for the people at them. It is the same data that powers RevenueBase's B2B data products, and a free account includes 500 credits to start. How these lists are built and judged.