R and Earthquake data

Earth quakes of the last 30 days

These example come from here. I follow instruction how to plot earthquage data into world map between 24.5. – 23.6.2012. My first test is not succesfull, so I make my copy paste tricks. Final result show now “right” magnitude.

## Plot world wide earth quakes of the last 30 days with magnitude >= 4.0
library(googleVis)
library(XML)
## Get earthquake data of the last 30 days
## That is ok, put for some reason I do not get right magnitude into picture.
eq=readHTMLTable(readLines("http://www.iris.edu/seismon/last30.html"))
eq <- eq[[2]] ## extract the eq table
summary(eq)
#something wrong with this  last30 file
#I have to copy and paste web-page data into Notepad and saved this into file earthquake.txt
#eq <- read.table("j:/todo/R_geodata/earthquake.txt", header=TRUE, sep="\t", na.strings="NA", dec=".", strip.white=TRUE)
#WEB-server datafile note I change MAG into magni
eq <- read.table("http://ekqvist.goeuropeinfo.com/rbloggerqvist/data/earthq/earthquake.txt", header=TRUE, sep="\t", na.strings="NA", dec=".", strip.white=TRUE)

# lat and lon must be the same variable
eq$loc=paste(eq$LAT, eq$LON, sep=":") ## create a lat:long location variable

# making geomap
earthq <- gvisGeoMap(eq, locationvar="loc", numvar="magni", hovervar="DATE", options=list(dataMode="markers"))

#plotting results into html file
#plot(earthq)
cat(earthq$html$chart, file="j:/todo/R_geodata/earthq.html")

By clicking this link you will see the result file.

Please, be patient because it takes about 30sec to open….

Greetings,

Marko

 

 

Leave a Reply

Your email address will not be published.

Copyright MySci 2019
Tech Nerd theme designed by Siteturner