What is the building standing on?
Faults, soft soils, slopes, shorelines, and former waterways can change how the same event is felt from one block to the next.
Read the earthquake reference
Know Your Place
Your address sits inside a system.
The ground, river, road, power line, building, and public boundary around you answer different questions. Put them together and the place becomes easier to read.
Start with connections
What reaches this place?
No single map can answer that. Begin with the layer that changes a decision, then keep the source close.
Where does water gather and go?
A river, culvert, tide, reservoir, well, or sewer may matter long before water reaches the front step.
Read the flooding referenceWhat does terrain do to the forecast?
Coast, valley, gorge, island, ridge, and pass can turn one regional system into very different local conditions.
Read the winter-storm referenceWhat has to stay open?
Look past the preferred route. Bridges, ferries, rail crossings, steep roads, and a single neighborhood exit deserve an alternate.
Where do ordinary services begin?
Water, power, fuel, communication, food, health care, and sanitation arrive through systems with different weak points and repair clocks.
See the ordinary functionsWho speaks for this location?
Alerts, evacuations, roads, utilities, health, and building safety may belong to different agencies. Find them before their names are urgent.
Find official helpQuestions worth carrying
The map is the beginning of the conversation.
A planning layer can show broad conditions. It cannot inspect a building, see tonight's road, or issue an order.
About the building
- When was it built, and what has changed since?
- Who knows the utilities and common systems?
- Who can assess it professionally?
About the route
- What is the normal way out?
- What bridge, slope, gate, ferry, or traffic pattern could change it?
- What is a safer alternate?
About the household
- What cannot safely stop?
- Who may need more time, power, transport, or help?
- What can be arranged with someone else?
About the official source
- Which agency or government is responsible?
- How does it issue alerts?
- When was the information last updated?
Reviewed July 25, 2026