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This week's series of earthquakes served as a reminder that the United States' earthquake risk extends far beyond the Pacific Coast. On Tuesday, Puerto Rico was rocked by a 6.4 magnitude earthquake. The earthquake knocked out power to most of the island, killing at least one. Also in recent days, minor earthquakes were felt in Tennessee and Texas. While there have been dozens of earthquakes with a 4.5 magnitude or higher throughout the United States in recent years, the eastern United States see relatively fewer. Only four earthquakes of 4.5 magnitude or greater in the last four years have impacted the eastern United States. But the issue is not the quantity of earthquakes in the eastern United States, but the impact. The USGS puts out a hazard map that shows the earthquake risk nationwide. The map shows areas such as the Pacific Coast and parts of Alaska and Hawaii with a high risk of peak ground accelerations. It turns out that areas of Missouri, Tennessee, Kentucky, Arkansas, Illinois and South Carolina.USGS scientist David Schwartz agrees that the Pacific Northwest all the way to Charleston, S.C., practically every region of the United States, has a risk of feeling a devastating earthquake."The nature of the crust changes as you go from east to west. The Central and Eastern US, the crust is really old, it is older it is colder, it is denser, than the crust in the west which is younger,” Schwartz said. “It’s broken up by many faults and warmer. These different crusts transmit seismic waves differently.”And this difference in geology means that a strong earthquake in the Eastern United States could cause damage over an extensive area.Although the Eastern United States has not had many major earthquakes in the last century, two of the most powerful quakes in American history have happened east of the Rockies. The magnitude 5.8 earthquake that caused damage to the Washington Monument in 2011 is only a minor example of the kind of earthquakes the Eastern United States could see.In 1811 and 1812, a series of earthquakes struck the Mississippi River valley along the New Madrid fault. The strongest of the quakes was a possible magnitude 7.8. The quake was felt across much of the Eastern United States.In 1866, a magnitude 7.0 rattled Charleston, S.C.“A repeat of any of those earthquakes would be extremely damaging, because the housing stock in the Central and Eastern U.S. has not been designed for earthquakes,” Schwartz said.According to a survey funded by the U.S. Army, a magnitude 7.7 earthquake located along the New Madrid fault could cause 85,900 deaths and 8 billion in damage. By comparison, Hurricane Katrina caused roughly 1,500 deaths and 0 billion in damage.What to do during an earthquakeDROP to the ground (before the earthquake drops you!),Take COVER by getting under a sturdy desk or table, andHOLD ON to it until the shaking stops. 2906

Tune in at 8 p.m. ET, 5 p.m. PT for the third Democratic Party presidential debate, featuring the top 10 candidates in the Democratic field based on polling. The candidatesFormer Vice President Joe BidenNew Jersey Sen. Cory BookerSouth Bend, Indiana Mayor Pete ButtigiegFormer Housing and Urban Development Secretary Julián CastroCalifornia Sen. Kamala HarrisMinnesota Sen. Amy KlobucharFormer Texas Rep. Beto O'RourkeVermont Sen. Bernie SandersMassachusetts Sen. Elizabeth WarrenEntrepreneur Andrew YangThe candidates on stage qualified by having 130,000 unique donors by Aug. 28, and earning 2 percent in four polls that sample voters nationally or in the states of New Hampshire, Iowa, Nevada, or South Carolina. A large field of candidates did not qualify for Thursday's debate. Candidates who appeared in previous debates such as Rep. Tim Ryan, Mayor Bill DeBlasio, Gov. Steve Bullock, author Marianne Williamson, Sen. Michael Bennet, Rep. John Delaney and Rep. Tulsi Gabbard failed to qualify. The aforementioned candidates have until Oct. 1 to qualify for the next debate in October. Activist Tom Steyer, who has not yet appeared in a debate, has recently qualified for the October debate, meaning the next debate could revert back to a two-night format. ModeratorsABC News' David Muir and Linsey Davis will join Univision anchor Jorge Ramos as moderators. Ramos and Muir, at separate events, moderated Democratic Party debates leading up to the 2016 election. Muir also moderated a Republican Party debate in 2016. FormatThe debate will mark the longest one so far in this debate season going a full three hours. Each candidate will be given one minute and 15 seconds for direct responses to questions, and 45 seconds for responses and rebuttals. Candidates will have the opportunity to deliver opening statements, but there will be no closing statements, ABC said. The top 10 on one stageThursday is arguably the night many voters have waited for with the entire top 10 slate of candidates on one stage. For instance, this is the first time that Elizabeth Warren and Joe Biden will share a stage. Will Warren take a shot at Biden now that she has the opportunity? We'll find out on Thursday. 2212

The Recording Academy says it has fired Deborah Dugan, its former president who questioned the integrity of the Grammy Awards nominations process and complained of sexual harassment and a toxic culture. The academy said Monday the decision was reached after “two exhaustive, costly independent investigations.” Dugan had been on administrative leave since mid-January, when she was ousted after multiple complaints of mistreatment from people in the organization. Dugan says her firing represents a continuation of the same patterns from the academy, and she'll keep fighting the organization from the outside. Dugan’s ouster played out days before the academy's Grammy Awards. 689

Trails through Michigan's Sleeping Bear Dunes National Lakeshore can be steep or sandy -- but people who require hiking mobility assistance can now rent a motorized chair with treaded tracks to get around.The fact that the chair has tracks rather than wheels makes rougher terrain much more accessible.The program is run by volunteer group 352

Today is the final day of keynote presentations for E3 2019, the largest gaming expo of the year. Perhaps the most anticipated announcements came from Nintendo, which always closes the show.The biggest Nintendo news of the day: 240