This analysis excludes the activity of search-engine spiders, USGS users, and transactions resulting in errors.
| 148581 | science |
| 27067 | combine |
| 3604 | kwic |
(Table shows only the 40 most frequently chosen terms.)
| 59943 | earthquakes |
| 23332 | earthquake occurrences |
| 6612 | volcanoes |
| 3703 | real-time monitoring and reporting |
| 3305 | maps and atlases |
| 1967 | mineral resources |
| 1581 | energy resources |
| 1578 | ground water |
| 1537 | seismology |
| 1502 | floods |
| 1367 | climate change |
| 1331 | earthquake probabilities |
| 1280 | map interfaces |
| 1248 | surface water (non-marine) |
| 1189 | topographic maps |
| 1013 | remote sensing |
| 960 | water quality |
| 958 | geospatial analysis |
| 915 | droughts |
| 903 | contamination and pollution |
| 808 | invasive species |
| 709 | oil resources |
| 615 | avian influenza |
| 567 | environmental health (human) |
| 552 | geologic maps |
| 514 | fires |
| 413 | California |
| 373 | human impacts |
| 354 | volcanic activity |
| 343 | river systems |
| 304 | acid deposition |
| 290 | hazards |
| 279 | land use and land cover |
| 275 | tectonic processes |
| 259 | ground-water flow |
| 252 | streamflow |
| 250 | earth structure |
| 247 | topics |
| 234 | soil resources |
| 233 | stream-gage measurement |