Mortgage application volume surged 12 percent two weeks ago but gave back a large chunk of that gain during the week ended February 4. last week. The Mortgage Bankers Association (MBA) says its Market Composite Index, a measure of that volume, decreased 8.1 percent on a seasonally adjusted basis from one week earlier and lost 6 percent on an unadjusted basis. The Refinance Index decreased 7 percent from the previous week and was 52 percent lower than the same week one year ago. The refinance share of mortgage activity dipped to 56.2 percent of total applications from 57.3 percent the pr...