I googled the subject and there are a large number of articles  discussing 
the effects of solar activity upon volcanism and earthquakes. Among  them 
are:
 
Solar Activity as a Triggering Mechanism for  Earthquakes
    -Smithsonian/NASA Astrophysics Data  System
"Solar activity . . . plays a significant but by no means exclusive  role 
in the triggering of earthquakes . . . "
 
Solar Activity and Global Seismicity of the  Earth
    -Bulletin of the Russian Academy of  Science
"A maximum in the number of earthquakes directly correlates with  the 
instant of a sudden increase in solar wind activity . . . "
 
About Possible Influence of Solar Activity upon Seismic and  Volcanic 
Actions:  Long Term Forecast
    -Transactions of the International Academy  of Science
 
Relationship between Global Seismicity and Solar  Activities
    -Book published by the Seismological  Society of China
 
    etc. etc.
 
So, it appears that the subject is worthy of further  study.
 
Al Hrubetz





I googled the subject and there are a large number of article=
s=20
discussing the effects of solar activity upon volcanism and earthquakes.=
 Among=20
them are:
 
Solar Activity as a Triggering Mechanism for=20
Earthquakes
    -Smithsonian/NASA Astrophysics Data=
=20
System
"Solar activity . . . plays a significant but by no means exc=
lusive=20
role in the triggering of earthquakes . . . "
 
Solar Activity and Global Seismicity of the=20
Earth
    -Bulletin of the Russian Academy of=
=20
Science
"A maximum in the number of earthquakes directly correlates=
 with=20
the instant of a sudden increase in solar wind activity . . . "
 
About Possible Influence of Solar Activity upon Seismic an=
d=20
Volcanic Actions:  Long Term Forecast
    -Transactions of the International Ac=
ademy=20
of Science
 
Relationship between Global Seismicity and Solar=20
Activities
    -Book published by the Seismological=
=20
Society of China
 
    etc. etc.
 
So, it appears that the subject is worthy of further=20
study.
 
Al Hrubetz