Hazards manager views frequency and magnitude by source region type

[MarionGadsby]

as hazards manager

I want to see frequency of tsunamis and from where they are sourced.

So compare how frequently the tsunamis are locally generated, how often they are regionally generated and how often they are generated by a distant source...oh, and also how big they are relative to one another.

[dmprk]

related to #24

[tmfrnz]

This requires data aggregation by attribute

[tmfrnz]

@MarionGadsby this may require additional explanation

[tmfrnz]

Important to note that there is a difference between a source region/location (eg Alpine Fault, Japan, Hawke's bay, attribute "source_location") and source region type (local, regional, distant) that we do not have currently included with the data.

[tmfrnz]

requires #77

[tmfrnz]

For frequency plot, see #73

[tmfrnz]

Duplicate of combination of elemental stories

• aggregate data by attribute (User aggregates records by attribute #72)
• plot aggregates on time plot (User visualises tsunami data on time/frequency plot #73)