Of the four signings, the 28-year-old Miranda is the most intriguing. He spent a good chunk of 2011 in the bigs with the Diamondbacks, posting a .717 OPS in 202 plate appearances.
The Mariners released righty Ricky Orta to free up a 40-man roster spot for one of their recent call-ups, according to a team press release.
Orta, 25, posted a 1.94 ERA, 8.9 K/9, and 3.9 BB/9 in 41.6 Double A innings last year. Baseball America ranked Orta 27th among Mariners prospects heading into the season, expecting him to reach the big league bullpen. However, he had Tommy John surgery in the spring.