Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 2.6 on date 21-09-2014 and time 22:23:00 (Italy) in region Tirreno Meridionale (MARE)

A magnitude ML 2.6 earthquake occured in region: Tirreno Meridionale (MARE), on

  • 21-09-2014 20:23:00 (UTC)
  • 21-09-2014 22:23:00 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 39.5500, 15.1230 at 342 km depth.

The earthquake was located by: Bollettino Sismico Italiano INGV.

Search earthquakes: Any within 30 km radius

The values of hypocentral coordinates and magnitude may be revised at a later time as more information becomes available.

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Municipalities within 20 km from the epicenter

No Italian municipalities within 20 km distance.

Municipalities with at least 50000 inhabitants

No Italian municipalities within 100 km from the epicenter with at least 50000 inhabitants.

Recent and historical seismicity

These maps show the seismic activity in different time intervals, before the seismic event to which they refer. Data reported in the first two maps come from the analysis carried out in real time by the personnel of the INGV Operating Rooms, immediately after each earthquake. The third map shows data from 1985 to the date of the earthquake: the locations are reviewed by the seismological analysts of the INGV Italian Seismic Bulletin (Bollettino Sismico Italiano dell’INGV). The localization parameters (hypocentral coordinates and magnitude) are the best possible estimate with the data available to the INGV, but are constantly updated according to further data that become available. The location and magnitude parameters, subsequently reviewed by seismological analysts, may vary.

Earthquakes of the 3 days preceding this event

Earthquakes of the 3 days preceding this event

This map shows the earthquake epicenters with magnitude ≥ 0.0, localized with data recorded by the National Seismic Network and other collaborative networks both in Italy and in neighboring countries, in the 72 hours preceding this event. The size of the circle indicates the different classes of magnitude. The colors indicate the different time intervals preceding the seismic event. The black and white star is the epicenter of the current earthquake.
Earthquakes of the 90 days preceding this event

Earthquakes of the 90 days preceding this event

This map shows the earthquake epicenters with magnitude ≥ 2.0, localized with data recorded by the National Seismic Network and other collaborative networks both in Italy and in neighboring countries, in the 90 days preceding this event. The size of the circle indicates the different classes of magnitude. The colors indicate the different time intervals preceding the seismic event. The black and white star is the epicenter of the current earthquake.
Earthquakes from 1985 to the date of the event

Earthquakes from 1985 to the date of the event

This map shows the earthquake epicenters with magnitude ≥ 3.0, localized with data recorded by the National Seismic Network and other collaborative networks both in Italy and in neighboring countries, from 1985 to the date of this event. The size of the circle indicates the different classes of magnitude. The colors indicate the different time intervals preceding the seismic event. The black and white star is the epicenter of the current earthquake.
Earthquakes since 1000 AD until 2019

Earthquakes since 1000 AD until 2019

This map shows the epicenters of the historical earthquakes catalogue CPT15 (Catalogo Parametrico dei Terremoti Italiani, 2015 version 3.0, https://doi.org/10.13127/cpti/cpti15.3) since 1000 AD until 2019. The size of the square indicates the different classes of magnitude. For earthquakes with magnitude ≥ 6.0, it is also shown the year of occurrence and the magnitude value. The black and white star is the epicenter of the current earthquake.
Seismic hazard

Seismic hazard maps provide probabilistic estimates of the earthquake ground shaking exceeding a given threshold in a given geographic region within a given time window. Thus, it is not a deterministic prediction - a target that may be never reached given the complexity of the earthquake physical phenomenon - nor of the maximum expected earthquake since this has extremely low probabilities to occur.

In 2004, it was published the seismic hazard map of Italy (http://zonesismiche.mi.ingv.it) that provides a picture of the most hazardous geographic regions. The seismic hazard map of Italy (GdL MPS, 2004; rif. Ordinanza PCM del 28 aprile 2006, n. 3519, All. 1b) provides the 10% probability of exceedance in 50 years of the horizontal acceleration at rock sites (i.e., Vs30>800 m/s; cat. A, 3.2.1 of the D.M. 14.09.2005).

The colours indicate the various values of the ground acceleration that have 10% to be exceeded within 50 years. In general, the colours associated to low values of acceleration refer to areas that are less hazardous and stronger earthquakes repeat less frequently although they may still occur.

Seismic hazard map

Seismic hazard map

This map shows the seismic hazard map of Italy for the region where the earthquake occurred.
Shakemap
Felt maps
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Bulletin
Rev1000 		ML 2.6 2014-09-21
20:23:00		 39.5502 15.1232 342 2015-09-21
09:39:02		 Bollettino Sismico Italiano INGV 18801581
Reviewed
Rev100 		ML 2.6 2014-09-21
20:23:00		 39.6568 15.1478 338 2014-10-21
12:08:56		 Sala Sismica INGV-Roma 8454791
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2014-09-21 20:23:00 ± 0.47
Latitude 39.5502 ± 0.0405
Longitude 15.1232 ± 0.0863
Depth (km) 342 ± 5 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 18801581

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 7432
Semi-minor axis of confidence ellipse (meter) 4046
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 108
Circular confidence region, given by single value of horizontal uncertainty (meter) 7430.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 195
Number of associated phases, regardless of their use for origin computation 20
Number of defining phases 20
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.37
Epicentral distance of station closest to the epicenter (degree) 0.56298
Epicentral distance of station farthest from the epicenter (degree) 1.73839
Number of stations at which the event was observed 14
Number of stations from which data was used for origin computation 14
Magnitudes information

ML:2.6

Field Value
Value 2.6
Uncertainty 0.1
Num. used stations 2
Type of magnitude ML
Reference to an origin 18801581
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2015-05-03 22:25:25

ML:2.6

Field Value
Value 2.6
Uncertainty 0.3
Num. used stations 4
Type of magnitude ML
Reference to an origin 8454791
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2014-09-21 20:38:11
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.MPAZ.HHZ. 2014-09-21T20:24:27.80 0.6 undecidable manual S 156 192.9624 150 -0.66 32
IV.PLAC.HHZ. 2014-09-21T20:24:25.74 1.0 undecidable manual S 137 166.611 153 -0.01 22
IV.MSRU.HHE. 2014-09-21T20:24:24.40 0.6 undecidable manual S 167 146.5422 156 0.5 43
IV.SERS.HHZ. 2014-09-21T20:24:23.80 0.6 undecidable manual S 113 146.0427 156 -0.06 47
IV.CELI.HHE. 2014-09-21T20:24:22.71 0.6 undecidable manual S 97 119.7912 160 0.96 37
IV.JOPP.HHZ. 2014-09-21T20:24:21.60 0.3 undecidable manual S 148 123.5874 160 -0.43 68
IV.MPAZ.HHZ. 2014-09-21T20:23:51.12 0.1 undecidable manual P 156 192.9624 150 -0.28 72
IV.SOI.EHZ. 2014-09-21T20:23:50.45 0.3 undecidable manual P 154 182.5839 151 -0.3 57
IV.GMB.BHE. 2014-09-21T20:23:50.13 0.3 undecidable manual P 158 165.0126 154 0.39 61
IV.MCSR.HHZ. 2014-09-21T20:23:49.99 0.3 undecidable manual P 177 165.0126 153 0.25 62
IV.PLAC.HHZ. 2014-09-21T20:23:49.74 0.1 undecidable manual P 137 166.611 153 -0.09 86
IV.CELI.HHE. 2014-09-21T20:23:48.44 0.1 undecidable manual P 97 119.7912 160 0.92 76
IV.IVPL.HHE. 2014-09-21T20:23:48.86 0.3 undecidable manual P 185 130.7691 158 0.85 57
IV.MILZ.HHE. 2014-09-21T20:23:48.62 0.1 undecidable manual P 176 142.1466 157 0.07 94
IV.SERS.HHZ. 2014-09-21T20:23:48.90 0.1 undecidable manual P 113 146.0427 156 0.16 92
IV.MSRU.HHE. 2014-09-21T20:23:48.63 0.1 undecidable manual P 167 146.5422 156 -0.13 92
IV.JOPP.HHZ. 2014-09-21T20:23:47.46 0.1 undecidable manual P 148 123.5874 160 -0.22 95
IV.CAR1.HHE. 2014-09-21T20:23:45.95 0.3 undecidable manual P 109 98.9232 163 -0.75 64
IV.T0702.EHE. 2014-09-21T20:23:45.84 0.1 undecidable manual P 77 84.1491 166 -0.38 100
IV.BULG.HHE. 2014-09-21T20:23:45.33 0.3 undecidable manual P 20 62.493 169 -0.31 79
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.CET2.HHN. ML:2.5 0.00002455 1.34 AML other m 2014-09-21T20:24:23.50
IV.CET2.HHE. ML:2.4 0.00002225 0.96 AML other m 2014-09-21T20:24:23.05
IV.MCSR.HHN. ML:2.8 0.00004235 0.3 AML other m 2014-09-21T20:23:52.32
IV.MCSR.HHE. ML:2.6 0.0000317 1.3 AML other m 2014-09-21T20:23:53.52
TDMT - Time Domain Moment Tensor
Fault Plane solutions in the area
Fault Plane solutions

Fault Plane solutions

The map reports the fault plane solutions for earthquakes in the region from 1977 to the date of this event. Red moment tensors are determined using the Regional Centroid Moment Tensor technique (RCMT, http://www.bo.ingv.it/RCMT) applied for earthquakes with magnitude larger than 4.5 in the Euro-Mediterranenan area. Occasionally, when a station azimuthal coverage exists RCMTs can be obtained also for earthquakes with magnitude down to 4.0. The gray moment tensors are obtained with the Time Domain Moment Tensor method (TDMT, /tdmt). This technique is applied to earthquakes with magnitude ML greater than 3.2, when it is possible. The size of symbols scales with the calculated moment magnitude Mw.
Download
Type Description Link
QuakeML - small Event, Origin, FocalMechanism Download
QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download
Waveforms Seismic signals in miniseed + resp format Download