Skip to main content

An official website of the United States government

Here's how you know

Here's how you know

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock () or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

U.S. Geological Survey

- Science Explorer
  
  Biology
  
  Climate
  
  Coasts
  
  Energy
  
  Environmental Health
  
  Geology
  
  Information Systems
  
  Maps and Mapping
  
  Minerals
  
  Methods and Analysis
  
  Natural Hazards
  
  Ocean
  
  Planetary Science
  
  Science Technology
  
  Water
- Mission Areas
  
  Core Science Systems
  
  Ecosystems
  
  Energy and Minerals
  
  Natural Hazards
  
  Water Resources
- Programs
- Regions
  
  Northeast Region
  
  Southeast Region
  
  Midcontinent Region
  
  Rocky Mountain Region
  
  Southwest Region
  
  Alaska Region
  
  Northwest-Pacific Islands Region
- Data
  
  Data Management
  
  Data Releases
  
  Real-time Data
  
  All Data
- Maps
  
  Map Releases
  
  Topographic (Topo) Maps
  
  Volcanic Maps
  
  All Maps
- Multimedia Gallery
  
  Audio
  
  Before and After Images
  
  Images
  
  Slideshows
  
  Stereograms
  
  Videos
  
  Webcams
  
  All Multimedia
- Publications
- Web Tools
  
  Alert and Notification Services
  
  APIs
  
  Data Access Tools
  
  Data Analysis Tools
  
  Data Visualizations
  
  Interactive Maps
  
  All Web Tools
- News Releases
  
  National News Releases
  
  State News Releases
  
  All News Releases
- I'm a Reporter
  
  Earthquake Questions
  
  Request Footage
  
  Multimedia Gallery
- Headquarters
  
  12201 Sunrise Valley Drive Reston, VA 20192
- Locations
- Staff Profiles
- Social Media
- Careers
- Contact Us
  
  1-888-392-8545
  
  Chat
  
  USGS Store 1-888-275-8747
- Organization
  
  Mission Areas
  
  Programs
  
  Regions
  
  Science Centers
  
  Observatories
  
  Laboratories
  
  Science Support Offices
- Doing Business
  
  Acquisition and Financial Assistance
  
  Partners and Cooperators
  
  Building Partnerships
- Emergency Management

Facebook
Twitter
Linkedin
Digg
Reddit
Pinterest
Email

Latest Earthquakes | Chat

Label

Label

U.S. Geological Survey

- Science Explorer
- Mission Areas
- Programs
- Regions
- Data
- Maps
- Multimedia Gallery
- Publications
- Web Tools
- News Releases
- I'm a Reporter
- Headquarters
- Locations
- Staff Profiles
- Social Media
- Careers
- Contact Us
- Organization
- Doing Business
- Emergency Management

Latest Earthquakes
Live WebChat
Share Social Media
- Facebook
- Twitter
- Linkedin
- Digg
- Reddit
- Pinterest
- Email

Breadcrumb

Images
Photography

Metro tunnel construction sketches

By Volcano Hazards Program

Metro tunnel construction sketches...

Original Thumbnail Medium

Detailed Description

Metro tunnel construction sketches

Explore Search

Natural Hazards
Metro1

Science Explorer
Mission Areas
Programs
Regions
Science Centers
Observatories
Laboratories
Frequently Asked Questions
Educational Resources
Special Topics

Data
Maps
Publications
Multimedia Gallery
Web Tools
Software
U.S. Board on Geographic Names
The National Map
USGS Library
USGS Store
Park Passes

Featured Stories
News Releases
Science Snippets
Technical Announcements
Employees in the News
Get Our News
Media Contacts
I'm a Reporter
Newsletters

Headquarters
Locations
Staff Profiles
Social Media
Careers
Contact Us

About Us
Survey Manual
Organization
Key Officials
Congressional
Budget
Careers and Employees
Doing Business
Emergency Management

Accessibility
FOIA
Site Policies
Privacy Policy
Site Map
DOI and USGS link policies apply
No FEAR Act
USA.gov
Vulnerability Disclosure Policy

U.S. Geological Survey

U.S. Department of the Interior

Contact USGS

1-888-392-8545

answers.usgs.gov