Table 2 Map elements recorded in the database and their frequency
Map element | Description | % of maps |
|---|---|---|
action | The map describes what to do during unrest or eruption | 20 |
alert level scheme | The alert level scheme for the volcano is described | 10 |
area map | An area map is included that shows the regional context | 22 |
audience and/or purpose | The intended audience or purpose is described | 10 |
cartographic legend | A legend is provided for cartographic symbols (e.g., roads, lakes) | 50 |
color scheme order | Color scheme is in order (e.g., red = high hazard) | 57 |
conditional validity | The conditions under which the map is valid are described (e.g., VEI < 5, central vent eruptions) | 23 |
coordinates | Geographic coordinates are shown | 58 |
eruptive history | The eruptive history of the volcano is described | 19 |
evacuation route | Evacuation routes are visually depicted on the map | 9 |
expiration | The conditions that will trigger map revision are described (e.g., summit changes, a time limit, new information) | 6 |
glossary of terms | Geological terms are defined in a glossary section | 5 |
hazard details | Hazard processes are defined or described | 17 |
hazard travel time | Hazard process arrival times or velocities are depicted or described | 12 |
hazard zone description | Hazard zones have accompanying descriptions beyond labels | 73 |
hazard zone legend | A legend is provided for the hazard zones | 88 |
impact details | Impact details (e.g., roof collapse, crop damage) are described | 19 |
impact locations | Specific towns or drainages are named or listed | 15 |
insets | Insets containing non-map information are included | 20 |
methods | Hazard zonation methods are described in the text | 37 |
more information source | Sources for additional information are given | 16 |
north arrow | A north arrow is included | 65 |
oblique image included | Oblique (3D) inset images of the terrain or hazard zones are shown | 4 |
other volcanos | Hazard zones from nearby volcanos are also shown on the map | 2 |
past deposits | Deposits from previous eruptions are shown visually | 15 |
person hours | The amount of time required to make the map is stated | 1 |
photos | Photos of the volcano, deposits, impacts, etc. are shown | 12 |
population information | Population information (e.g., numbers of inhabitants in towns or hazard zones) is depicted or described | 8 |
references | Reference literature is cited | 16 |
safe areas | Safe areas, including shelters or muster points, are depicted | 12 |
scale bar | A scale bar is included | 85 |
version number | Version numbers or a revision history is provided | 10 |
wind rose diagram | A wind rose diagram of either wind directions or tephra dispersal directions is provided | 1 |