Hi there, here are a few from this site (MyNewMarkets.com) that specifically mention EQSL:
Earthquake, Flood & Wind Buybacks
Quake - DIC
Earthquake Coverage
Earthquake Insurance-Residential and Commercial
CIBA
companies sometimes have a contact with an email / phone listed below the 'ask a question' field on these product pages. If not, there will always be a phone number listed either on this page or in their company profile (company name) linl.