M5.5+ Earthquake Count for May 11-17: Can It Top Nine?

The global seismic network logged M5.5 and above earthquakes at a pace that kept this market alive through the weekend. The question traders are pricing right now: does the week of May 11 through May 17 close with more than nine qualifying events? At 43.5%, the market says probably not, but the window is wide open.

This is a multi-outcome market tracking discrete M5.5-plus earthquakes over a seven-day window, per USGS global seismic data. Historically, the Earth averages roughly 10 to 15 M5.5 or stronger earthquakes per week, which means the greater-than-nine bucket is squarely in the statistical middle. The market is pricing uncertainty, not science, and right now uncertainty leans toward the count staying at nine or below.

How the M5.5-Plus Earthquake Count Contract Works

This contract resolves based on the total number of M5.5 or stronger earthquakes recorded globally between May 11 and May 17, 2026. Resolution follows USGS final earthquake catalog data for the window. Multiple outcomes are available: 4, 5, 6, 7, 8, 9, greater than 9, and three or fewer.

• YES (greater than 9) — $0.44 (43.5% implied probability): Pays if USGS records ten or more M5.5-plus earthquakes during the window.
• NO (9 or below, across all other buckets) — $0.57 (56.5% combined implied probability): Pays if the count lands at nine or fewer, distributed across the 9, 8, 7, 6, 5, 4, and three-or-fewer outcomes.

The path to the greater-than-nine outcome closing out below its threshold runs through seismically quiet periods along the Pacific Ring of Fire, Alpide Belt, and Mid-Atlantic Ridge. USGS data shows roughly 40% of weeks in any given year fall at or below nine M5.5-plus events. That means quiet weeks happen, but they are not the norm. The market pricing reflects that balance.

Momentum and Market Signals

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The momentum composite is flat to slightly negative: zero movement in the last hour, a 0.5% decline over 24 hours, and a trend score of 23.65. Together, those signals say the market is not reacting to a specific data catalyst right now. The price drifted lower as the week opened, consistent with early-week uncertainty before daily USGS counts accumulate.

Volume here is extremely thin. Total traded volume sits at $1,573, with $1,315 of that changing hands in the last 24 hours. Liquidity stands at $23,714. These are small numbers. With volume this low, a single active trader moving a few hundred dollars can shift the probability by several percentage points. The price is not a crowd signal right now. It is a thin-market signal.

• 1h change is flat at +0.0%, suggesting no immediate catalyst pushed traders in either direction at the start of the May 11 window.
• 24h change is -0.5%, a slight drift toward the NO side, consistent with early-week caution as USGS counts for May 11 begin accumulating.
• Trend score of 23.65 places this market in a neutral range, neither accelerating toward YES nor collapsing.
• Liquidity at $23,714 against volume of $1,573 confirms that new money has not entered this contract in size. Price moves on thin liquidity, not conviction.
• Related market context: The seven-or-above earthquake count by June 30 sits at 86% YES, signaling traders expect a seismically active broader period, which is a mild tailwind for the greater-than-nine outcome here.

Lines Analysis: What the Seismic Data Says

The USGS global earthquake catalog consistently records between 10 and 20 M5.5-plus events per week during active periods along the Pacific Ring of Fire. The western Pacific, including the Philippines, Japan, Tonga, and Indonesia, accounts for a large share of these events. Any activity cluster in those zones this week pushes the count toward and past the ten-event threshold. The 86% probability on the broader seven-plus earthquake June 30 market suggests the prediction market community broadly expects elevated seismicity this season.

What makes the count staying at nine or below realistic is that seismic activity is uneven by week. USGS data over the last decade shows roughly 35 to 40 percent of weeks globally fall at nine or fewer M5.5-plus events. Quiet windows happen most often when the major subduction zones along the Pacific Rim go a few days without releasing significant stress. That is unpredictable at the weekly scale, which is precisely why this market exists.

• USGS real-time earthquake feeds updating daily through May 17 are the primary data signal. Any spike in M5.5-plus events in the western Pacific or Central America will push YES pricing higher.
• Any global M7.0-plus event this week typically triggers aftershock sequences that push weekly M5.5-plus counts well above ten, making it the single biggest wildcard for this contract.
• Seismically quiet days in the Indonesia-Philippines arc reduce the weekly count fastest, given those zones generate roughly 30 percent of global M5.5-plus activity in a typical week.
• The related market tracking seven-plus earthquakes by June 30 at 86% provides context that broader seismic expectations are elevated, which tilts background probability toward active weeks.

With $1,573 in total volume, the current 43.5% probability on greater-than-nine reflects a thin market that has not attracted heavy conviction from either side. The historical base rate for exceeding nine M5.5-plus events in a week is above 60 percent, which suggests the market may be slightly underpricing YES relative to the long-run average. Here is what the measurements are telling us: statistically, more than nine events is the more likely outcome, but the market has not committed to that view yet.

LINES VERDICT

Statistically Underpriced but Thin

The historical USGS average for weekly M5.5-plus earthquake counts sits above the ten-event threshold more than half the time, making the greater-than-nine outcome statistically favored. The market at 43.5% has not priced that base rate in yet.

What the market says: 43.5% implies traders lean toward the count staying at nine or below, but thin liquidity means this number can shift sharply on a single active day of seismicity before May 17, 2026.

Key unknown: A major M7.0-plus event anywhere along the Pacific Ring of Fire this week would trigger aftershock sequences that almost certainly push the M5.5-plus count past ten, repricing this contract rapidly.

Scientific Context

USGS global seismic monitoring covers earthquakes of M5.5 and above with near-complete detection worldwide. The agency’s real-time catalog is the authoritative resolution source for this contract. Over the past decade, USGS records show that weeks with fewer than ten M5.5-plus events are the minority globally, occurring roughly 35 to 40 percent of the time. The related market tracking M7.0-plus earthquakes by June 30 at 86% reflects broader market consensus that the current seismic period is active, not quiet. The data doesn’t care about the politics of any individual week. What moves this contract before May 17 is the USGS daily count, updated in near-real time, and any major triggering event in a high-density seismic zone.

Frequently Asked Questions

• What does 43.5% probability mean here? It means the market assigns a 43.5% chance that USGS records more than nine M5.5-plus earthquakes globally between May 11 and May 17, 2026.
• What does the NO side cover? All outcomes at nine or fewer M5.5-plus earthquakes pay out across separate buckets: 9, 8, 7, 6, 5, 4, and three or fewer events for the week.
• What single event would most move this price? A M7.0-plus earthquake anywhere along the Pacific Ring of Fire would trigger aftershocks that push the weekly count well above ten, sharply repricing YES upward.
• When does this market resolve? Resolution is set for May 17, 2026, based on the final USGS earthquake catalog count for the May 11 through May 17 window.
• Is the volume here reliable? Total volume is only $1,573, which is very thin. Price can shift several percentage points on a small number of trades, so the current probability reflects limited market conviction.

This analysis reflects market conditions as of 2026-05-11 06:37:50. Prediction market probabilities are volatile and shift as new data and regulatory decisions emerge, especially as the 2026-05-17 00:00:00 resolution date approaches. Lines.com does not accept bets or provide financial or gambling advice. All market outcomes are uncertain.