A moderate earthquake with a preliminary magnitude of 5.4 has struck the Atlantic Ocean off the coast of Portugal, centered near Lisbon, according to seismologists. Shaking was felt across the region. The earthquake, which struck at 5:11 a.m. local time on Monday, was centered in the ocean about 64 kilometers (40 miles) southwest of Sesimbra, or 85 kilometers (53 miles) southwest of the capital city. The U.S. Geological Survey (USGS) said Monday’s tremor had a magnitude of 5.4 and struck about 10 kilometers (6 miles) below the seabed, making it a shallow earthquake. Portugal’s seismological ag…