M 1.5 - 34 km NW of Mentone, Texas

M 1.2 - 18 km WSW of Johannesburg, CA

M 1.1 - 3 km NNW of The Geysers, CA

M 5.0 - Reykjanes Ridge

M 4.4 - Reykjanes Ridge

M 2.0 - 64 km ENE of Wiseman, Alaska

M 1.6 - 19 km NNW of Indian Springs, Nevada

M 1.8 - 61 km S of Whites City, New Mexico

M 0.3 - 5 km W of Cobb, CA

The ID is a unique fingerprint that is calculated based on the values of all non-Fusionbase specific columns.

fb_id

Typical values:
A (generally) two-character network identifier with a (generally) eight-character network-assigned code.

event_id

Typical values:
"2013lgaz", "c000f1jy", "71935551"

event_code

Typical values:
“USGS Magnitude 1+ Earthquakes, Past Day”, “USGS Magnitude 4.5+ Earthquakes, Past Month”

title

Typical values:
“earthquake”, “quarry”

type

There is only one reserved status DELETE, which indicates the product has been deleted. Any other value indicates a product update, and may vary depending on product type.

status

This flag is set to True for large events in oceanic regions and False otherwise. The existence or value of this flag does not indicate if a tsunami actually did or will exist. If the flag value is True, the event will include a link to the NOAA Tsunami website for tsunami information. The USGS is not responsible for Tsunami warning; we are simply providing a link to the authoritative NOAA source. See http://www.tsunami.gov/ for all current tsunami alert statuses.

tsunami

Typical values:
",ci15296281,us2013mqbd,at00mji9pf,"

sources

Typical values:
“,cap,dyfi,general-link,origin,p-wave-travel-times,phase-data,”

types

Typical values:
[-1.0, 10.0]

Additional information:
The magnitude reported is that which the U.S. Geological Survey considers official for this earthquake, and was the best available estimate of the earthquake’s size, at the time that this page was created. Other magnitudes associated with web pages linked from here are those determined at various times following the earthquake with different types of seismic data. Although they are legitimate estimates of magnitude, the U.S. Geological Survey does not consider them to be the preferred "official" magnitude for the event. Earthquake magnitude is a measure of the size of an earthquake at its source. It is a logarithmic measure. At the same distance from the earthquake, the amplitude of the seismic waves from which the magnitude is determined are approximately 10 times as large during a magnitude 5 earthquake as during a magnitude 4 earthquake. The total amount of energy released by the earthquake usually goes up by a larger factor: for many commonly used magnitude types, the total energy of an average earthquake goes up by a factor of approximately 32 for each unit increase in magnitude. There are various ways that magnitude may be calculated from seismograms. Different methods are effective for different sizes of earthquakes and different distances between the earthquake source and the recording station. The various magnitude types are generally defined so as to yield magnitude values that agree to within a few-tenths of a magnitude-unit for earthquakes in a middle range of recorded-earthquake sizes, but the various magnitude-types may have values that differ by more than a magnitude-unit for very large and very small earthquakes as well as for some specific classes of seismic source. This is because earthquakes are commonly complex events that release energy over a wide range of frequencies and at varying amounts as the faulting or rupture process occurs. The various types of magnitude measure different aspects of the seismic radiation (e.g., low-frequency energy vs. high-frequency energy). The relationship among values of different magnitude types that are assigned to a particular seismic event may enable the seismologist to better understand the processes at the focus of the seismic event. The various magnitude-types are not all available at the same time for a particular earthquake. Preliminary magnitudes based on incomplete but rapidly-available data are sometimes estimated and reported. For example, the Tsunami Warning Centers will calculate a preliminary magnitude and location for an event as soon as sufficient data are available to make an estimate. In this case, time is of the essence in order to broadcast a warning if tsunami waves are likely to be generated by the event. Such preliminary magnitudes are superseded by improved estimates of magnitude as more data become available. For large earthquakes of the present era, the magnitude that is ultimately selected as the preferred magnitude for reporting to the public is commonly a moment magnitude that is based on the scalar seismic-moment of an earthquake determined by calculation of the seismic moment-tensor that best accounts for the character of the seismic waves generated by the earthquake. The scalar seismic-moment, a parameter of the seismic moment-tensor, can also be estimated via the multiplicative product rigidity of faulted rock x area of fault rupture x average fault displacement during the earthquake.

Typical values:
“Md”, “Ml”, “Ms”, “Mw”, “Me”, “Mi”, “Mb”, “MLg”

Additional information:
See Magnitude Types Table.

mag_type

Larger numbers indicate a more significant event. This value is determined on a number of factors, including: magnitude, maximum MMI, felt reports, and estimated impact.

Typical values:
[0, 1000]

Typical values:
ak, at, ci, hv, ld, mb, nc, nm, nn, pr, pt, se, us, uu, uw

This parameter provides a measure of the fit of the observed arrival times to the predicted arrival times for this location. Smaller numbers reflect a better fit of the data. The value is dependent on the accuracy of the velocity model used to compute the earthquake location, the quality weights assigned to the arrival time data, and the procedure used to locate the earthquake.

Typical values:
[0.13,1.39]

In general, the smaller this number, the more reliable is the calculated horizontal position of the earthquake. Earthquake locations in which the azimuthal gap exceeds 180 degrees typically have large location and depth uncertainties.

Typical values:
[0.0, 180.0]

Additional information:
Number of seismic stations which reported P- and S-arrival times for this earthquake. This number may be larger than the Number of Phases Used if arrival times are rejected because the distance to a seismic station exceeds the maximum allowable distance or because the arrival-time observation is inconsistent with the solution.

1 degree is approximately 111.2 kilometers. In general, the smaller this number, the more reliable is the calculated depth of the earthquake.

Typical values:
[0.4, 7.1]

dmin

Computed by DYFI. While typically reported as a roman numeral, for the purposes of this API, intensity is expected as the decimal equivalent of the roman numeral.

Typical values:
[0.0, 10.0]

felt

Computed by ShakeMap. While typically reported as a roman numeral, for the purposes of this API, intensity is expected as the decimal equivalent of the roman numeral.

Typical values:
[0.0, 10.0]

Typical values:
“green”, “yellow”, “orange”, “red”.

alert

Additional information:
We use a GeoNames dataset to reference populated places that are in close proximity to a seismic event. GeoNames has compiled a list of cities in the United States where the population is 1,000 or greater (cities1000.txt). This is the primary list that we use when selecting nearby places. In order to provide the public with a better understanding for the location of an event we try to list a variety of places in our nearby places list. This includes the closest known populated place in relation to the seismic event (which based on our dataset will have a population of 1,000 or greater). We also include the next 3 closest places that have a population of 10,000 or greater, and finally make sure to include the closest capital city to the seismic event. The reference point for the descriptive locations is usually either the City Hall of the town (or prominent intersection in the middle of town if there is no City Hall), but please refer to the GeoNames website for the most accurate information on their data. If there is no nearby city within 300 kilometers (or if the nearby cities database is unavailable for some reason), the Flinn-Engdahl (F-E) seismic and geographical regionalization scheme is used. The boundaries of these regions are defined at one-degree intervals and therefore differ from irregular political boundaries. For example, F-E region 545 (Northern Italy) also includes small parts of France, Switzerland, Austria and Slovenia and F-E region 493 (Chesapeake Bay Region) includes all of the State of Delaware, plus parts of the District of Columbia, Maryland, New Jersey, Pennsylvania and Virginia. Beginning with January 2000, the 1995 revision to the F-E code has been used in the QED and PDE listings. As an agency of the U.S. Government, we are expected to use the names and spellings approved by the U.S. Board on Geographic Names. Any requests to approve additional names should be made to the U.S. Board on Geographic Names.

place

geometry

detail

Times are reported in milliseconds since the epoch (1970-01-01T00:00:00.000Z), and do not include leap seconds.

Additional information:
We indicate the date and time when the earthquake initiates rupture, which is known as the "origin" time. Note that large earthquakes can continue rupturing for many 10's of seconds. We provide time in UTC (Coordinated Universal Time). Seismologists use UTC to avoid confusion caused by local time zones and daylight savings time. On the individual event pages, times are also provided for the time at the epicenter, and your local time based on the time your computer is set.

timestamp_ms

Times are reported in milliseconds since the epoch. In certain output formats, the date is formatted for readability.

updated_timestamp_ms

timezone

event_time_iso

updated_time_iso

The ISO-8601 timestamp of when the record was added to the data stream.

fb_datetime

Each new set of records that is added to the data stream gets automatically versioned by Fusionbase.

fb_data_version

The USGS monitors and reports on earthquakes, assesses earthquake impacts and hazards, and conducts targeted research on the causes and effects of earthquakes. We undertake these activities as part of the larger National Earthquake Hazards Reduction Program (NEHRP), a four-agency partnership established by Congress.

US Geological Survey Earthquakes

US Geological Survey Earthquakes

Attributes

Related Datasets