[Tagging] Active volcanoes

Clifford Snow clifford at snowandsnow.us
Wed Jan 29 19:56:16 UTC 2020


Through a friend at the University of Washington I received the following
reply:

The Global Volcanism Program (GVP) that Steve pointed to you has the most
consistently applied standard for classifying volcanoes around the globe.
In that context, any volcano that has erupted in the Holocene [1] would be
considered "active" -- which I know is confusing since no Cascade volcanoes
are currently erupting or experiencing significant unrest.  "Active" more
speaks to whether the volcano could erupt again (and hence is still alive,
or "active"), which is judged by whether it has erupted in the Holocene as
well as whether there are signs of life (earthquakes under the volcano,
degassing, deformation, etc.).

The GVP also has a series of tags for things like primary volcano type,
last known eruption, activity evidence, dominant rock type, etc. Having the
GVP hyperlink volcano number would also allow users to see more detail
about each volcano.


I like the suggestion of having a link to GVP article. It's worth noting
that we can not use the information contained in GVP articles because of
licensing incompatibilities. GVP restricts use to non-commercial use and
requires attribution. I have reached out to GVP to discuss linking to their
database.

My recommendation would be to not to expand volcano:status=active to as it
is today. If we can link to the GVP database it would allow data consumers
the ability to quickly gather the most recent information, much like the
wikipedia/wikidata tags do today.

[1] Holocene definition, for us non geologist, according to Wikipedia "The
Holocene is the current geological epoch. It began approximately 11,650 cal
years before present, after the last glacial period, which concluded with
the Holocene glacial retreat."

Best,
Clifford

On Mon, Jan 27, 2020 at 11:05 AM Mark Wagner <mark+osm at carnildo.com> wrote:

> On Mon, 27 Jan 2020 18:47:39 +1100
> Warin <61sundowner at gmail.com> wrote:
>
> > On 27/1/20 6:24 pm, John Willis via Tagging wrote:
> > > I agree with you that this is the scale that volcanologists use,
> > > but people want to draw a distinction between something that
> > > erupted recently compared sometime in the last 200 years
> > >
> > > Perhaps it is easier to just apply the “active” and “Frequently
> > > active” tags via this third-party data source,
> >
> > "frequently active " means what?
> >
> > If it erupted last year .. but not for 200 years before that I'd not
> > call it 'frequent'.
> >
> >
> > > but it would completely remove mapper’s ability to add a mountain
> > > to this list via tagging.
> >
> >
> > Possibly "last_eruption=" if that is what you want???
> >
>
> "last_eruption" isn't that useful for determining activity: the
> majority of the world's volcanoes are cinder cones, which almost never
> erupt twice or more.
>
> --
> Mark
>
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>


-- 
@osm_washington
www.snowandsnow.us
OpenStreetMap: Maps with a human touch
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