Ellsworth said the earthquakes are shallow, occurring at an estimated 2.5 to 4 miles below the surface of the ground.
Though the depths are somewhat uncertain due to a lack of detailed information about the area geology, that is something that can be remedied, he wrote.
SMU researchers are relocating several of the NetQuakes instruments to better surround the source region of the earthquakes, he said.
Meanwhile, Texas Railroad Commissioner David Porter is expected to discuss the issue with the public this week. A town hall meeting is scheduled for 5-7 p.m. Thursday at the Azle High School Auditorium, located at 1200 Boyd Road in Azle. Other state and local officials are expected to be in attendance.
With some experts saying the earthquakes could be occurring as a result of injection wells in the area, many have called on the Texas Railroad Commission, which regulates the oil and gas industry in Texas, to investigate whether the earthquakes have been triggered by activity in the area.
RRC Chairman Barry Smitherman told the Democrat earlier this month the commission will likely also ask a group with the qualifications and experience to do a study of the issue.
Meanwhile, researchers attempting to narrow down the location of the earthquake epicenters are making headway.