HAWAII

This directory contains 3D velocity model, earthquake relocations, and focal solutions for Hawaii using the HVO seismic data.

References:

Lin, G., P. M. Shearer, R. S. Matoza, P. G. Okubo, and F. Amelung (2014), Three-dimensional seismic velocity structure of Kilauea and Mauna Loa volcanoes from local seismic tomography, J. Geophys. Res., 119, 1-16, doi:10.1002/2013JB010820.

Lin, G. and P. G. Okubo (2016), A large refined catalog of earthquake relocations and focal mechanisms for the entire island of Hawaii and their seismotectonic implications, J. Geophys. Res., 121, doi:10.1002/2016JB013042. 

Location file format description:

394008 1992  1  5  4 31  9.080  19.30526 -155.22516   8.211  1.4

cuspid  year  mo  dy  hr  mn  sec  qlat  qlon  qdep  qmag

where

      394008 = HVO event id

      1992 = year

         1 = month

         5 = day

         4 = hour

        31 = minute

    9.080 = second

     19.30526 = latitude

-155.22516 = longitude

     8.211 = depth (km)

      1.4 = HVO assigned magnitude 

​Focal mechanism file format description:

    206216 1986  1  1  2 45 11.270   1.300    19.42900 -155.33083   4.900   205  76  -160   48   51   9     25   4    24   50    88    51

    cuspid year mo dy hr mn  sec     qmag       qlat      qlon      qdep    str  dip rak   var1 var2 npol mfrac qual prob stdr magap mpgap

where

    206216 = HVO cuspid

      1986 = year

         1 = month

         1 = day

         2 = hour

        45 = minute

    11.270 = second

     1.300 = HVO assigned magnitude

  19.42900 = latitude

-155.33083 = longitude

     4.900 = depth (km)

       205 = strike (degree)

        76 = dip (degree)

      -160 = rake (degree)

        48 = variance of plane 1

        51 = variance of plane 2

         9 = number of observations

        25 = fraction misfit polarities

         4 = solution quality (1=best; 4=worst)

        24 = probability true mechanism is "close" to preferred solution

        50 = station distribution

        88 = maximum azimuthal gap

        51 = maximum takeoff gap