Wikidata:Property proposal/JMA Magnitude
JMA MagnitudeEdit
Originally proposed at Wikidata:Property proposal/Natural science
Description | Magnitude of an earthquake according to Japan Meteorological Agency |
---|---|
Represents | Japanese Meteorological Agency magnitude scale (Q1676638) |
Data type | Quantity |
Template parameter | "scale" in Template:地震, "magnitude" in Template:Infobox earthquake |
Domain | earthquake (Q7944) |
Allowed values | 0 - 10 |
Allowed units | null |
Example 1 | 2011 Tōhoku earthquake and tsunami (Q36204) → 8.4 (see also here) |
Example 2 | 2018 Osaka earthquake (Q55080471) → 6.1 |
Example 3 | 2016 Kumamoto earthquakes (Q23825118) → 7.3 |
Source | Revision of JMA Magnitude, database |
Motivation
Property for magnitudes is provided as earthquake magnitude on the moment magnitude scale (P2527) or earthquake magnitude on the Richter magnitude scale (P2528). But JMA magnitude, used in Japan, is not provided for now... 軽快 (talk) 05:15, 26 June 2018 (UTC)
Discussion
- Support David (talk) 15:40, 26 June 2018 (UTC)
- Comment @軽快: - can you explain how this is different from Wikidata:Property proposal/JMA Seismic Intensity Scale? Also these should be linked by a "see also" relation (when/if created). ArthurPSmith (talk) 18:38, 26 June 2018 (UTC)
- @ArthurPSmith: JMA Seismic Intensity Scale ("震度") and JMA Magnitude ("マグニチュード") are completely different concepts, although they tend to correlate. JMA Seismic Intensity Scale represents how the ground shook in a given place and usually maximum value observed is used. On the other hand, JMA Magnitude is the overall strength of the earthquake, and is related to approximately related to the released seismic energy. The former is a categorical scale, while the latter is continuous value. And the former depends on the depth of the hypocenter and other geological factors, but the latter doesn't. --Okkn (talk) 16:31, 6 July 2018 (UTC)
- Weak oppose I think it's useful property, but there are some other magnitude (Q500062) such as Surface wave magnitude (Q672828) (M_{s}), body wave magnitude (M_{b}), tsunami magnitude (M_{t}). All these seismic magnitude scales are established based on Richter scale (Q38768), and are comparable with each other (to some extent, at least). I think all these magnitude data available for each earthquake should be recorded in wikidata, but I'm afraid if we make distinct properties for each of these, it would be too detailed. So I think it's better to make a more generalized property, corresponding to magnitude (Q500062), instead of this specific property. And we can use the property using criterion used (P1013) as a qualifier. (e.g. 2011 Tōhoku earthquake and tsunami (Q36204) (seismic magnitude) 8.4 / criterion used (P1013) Japanese Meteorological Agency magnitude scale (Q1676638) / 2011 Tōhoku earthquake and tsunami (Q36204) (seismic magnitude) 9.0 / criterion used (P1013) moment magnitude scale (Q201605)) --何三（S） (talk) 00:33, 27 June 2018 (UTC)
- @何三（S）: Most people don't understand there are several definitions of "magnitude", so if we unify these magnitude properties, there is a risk that it could be misused. And the number of definitions of magnitude needed to use in Wikidata does not amount to much at this time. So I think creating a specific property for JMA Magnituide is better than unifying (and deleting) already existing properties earthquake magnitude on the moment magnitude scale (P2527) and earthquake magnitude on the Richter magnitude scale (P2528). --Okkn (talk) 16:31, 6 July 2018 (UTC)
- @Okkn: I think the property for seismic magnitude should be unified all the more because "most people don't understand there are several definitions". For example, if someone want to get the list of earthquakes which exceeds M8.0, it's easier to be able to write query like
- @何三（S）: Most people don't understand there are several definitions of "magnitude", so if we unify these magnitude properties, there is a risk that it could be misused. And the number of definitions of magnitude needed to use in Wikidata does not amount to much at this time. So I think creating a specific property for JMA Magnituide is better than unifying (and deleting) already existing properties earthquake magnitude on the moment magnitude scale (P2527) and earthquake magnitude on the Richter magnitude scale (P2528). --Okkn (talk) 16:31, 6 July 2018 (UTC)
SELECT DISTINCT * WHERE{ ?s wdt:P31 wd:Q7944. ?s wdt:P(Magnitude) ?M. FILTER (?M > 8.0) }
- than
SELECT DISTINCT * WHERE{ ?s wdt:P31 wd:Q7944. { ?s wdt:P(JMA Magnitude) ?M. FILTER (?M > 8.0) } UNION { ?s wdt:P(Moment Magnitude) ?MM. FILTER (?MM > 8.0) } UNION { ... } }
- because the latter can be written only when he/she know all the magnitude type. It's the typical bad point of making too detailed properties. I don't think there are so many people who want to know the magnitude measured only by a specific method, and even in that situation, they can make the query using qualifiers. --何三（S） (talk) 01:38, 9 July 2018 (UTC)
- @何三（S）: The former query should not be written because it losses the crucial information about what that value is. We cannot believe all of the values stored in "(generalized) magnitude" claims are close to the value of earthquake magnitude on the moment magnitude scale (P2527) etc. (Suppose some definitions of magnitude tend to indicate very high values.)
- The latter query is not so difficult to write for people who have already familiar with SPARQL, but, on the other hand, if they want to get just the moment magnitude scale (Q201605) of 2011 Tōhoku earthquake and tsunami (Q36204), for example, they need to know the detailed data model of Wikidata qualifiers:
SELECT ?earthquake ?earthquakeLabel ?momentMagnitude WHERE { BIND(wd:Q36204 as ?earthquake). #[[Q36204|2011 Tōhoku earthquake and tsunami]] ?earthquake p:P(Magnitude) ?statement. ?statement pq:P1013 wd:Q201605. #[[Property:P1013|criterion used]], [[Q201605|moment magnitude scale]] ?statement ps:P(Magnitude) ?momentMagnitude. SERVICE wikibase:label { bd:serviceParam wikibase:language "[AUTO_LANGUAGE],en". } }
- Specific properties allow us to write a simple query:
SELECT ?earthquake ?earthquakeLabel ?momentMagnitude WHERE { BIND(wd:Q36204 as ?earthquake). #[[Q36204|2011 Tōhoku earthquake and tsunami]] ?earthquake wdt:P2527 ?momentMagnitude #[[Property:P2527|earthquake magnitude on the moment magnitude scale]] SERVICE wikibase:label { bd:serviceParam wikibase:language "[AUTO_LANGUAGE],en". } }
- Of course, it is a trade-off, but in my opinion, specific properties are superior in the accuracy of information and in ease in handling. --Okkn (talk) 06:52, 9 July 2018 (UTC)
- Oppose per 何三（S）'s solution (and seconding Arthur's concern); but if we do make this, the datatype should be "item". Andy Mabbett (Pigsonthewing); Talk to Andy; Andy's edits 20:36, 29 June 2018 (UTC)
- Support as per my above comments. --Okkn (talk) 16:31, 6 July 2018 (UTC)
- Support --Araisyohei (talk) 22:11, 21 August 2018 (UTC)
@ديفيد عادل وهبة خليل 2, Araisyohei, ArthurPSmith, 何三（S）, Pigsonthewing, Okkn: @軽快: Done: JMA Magnitude (P5900). − Pintoch (talk) 06:59, 21 September 2018 (UTC)