Earthquake with magnitude of ML 0.4 on date 25-02-2012 and time 01:17:41 (Italy) in region 2 km NW Accumoli (RI)

A magnitude ML 0.4 earthquake occured in region: 2 km NW Accumoli (RI), on

  • 25-02-2012 00:17:41 (UTC)
  • 25-02-2012 01:17:41 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.71, 13.23 at 8 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.

Municipalities within 20 km from the epicenter

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
Accumoli RI 2 667 667
Arquata del Tronto AP 9 1178 1845
Amatrice RI 10 2657 4502
Cittareale RI 11 482 4984
Norcia PG 15 4957 9941
Acquasanta Terme AP 16 2916 12857
Montegallo AP 17 523 13380
Cascia PG 18 3217 16597
Campotosto AQ 20 542 17139

Municipalities with at least 50000 inhabitants

An earthquake occurred to
39 Km W of Teramo (54892 inhabitants)
42 Km NW of L'Aquila (69753 inhabitants)
51 Km E of Terni (111501 inhabitants)
51 Km SE of Foligno (57155 inhabitants)
78 Km W of Montesilvano (53738 inhabitants)
82 Km SE of Perugia (166134 inhabitants)
85 Km W of Pescara (121014 inhabitants)
86 Km W of Chieti (51815 inhabitants)
89 Km NE of Guidonia Montecelio (88673 inhabitants)
90 Km NE of Tivoli (56533 inhabitants)
98 Km E of Viterbo (67173 inhabitants)
Recent and historical Seismicity
Seismic hazard
Felt maps
The earthquake effects in MCS scale as obtained from the compiled questionnaire

The earthquake effects in MCS scale as obtained from the compiled questionnaire

This map shows the distribution of the effects of the earthquake on the territory in terms of the MCS (Mercalli-Cancani-Sieberg) intensity scale. The intensities are determined using the data provided in the questionnaire ( that are analysed using robust statistical techniques since they are not verified individually. Specifically, the assignment of MCS intensities greater or equal the VI degree of the MCS scale require opportune in situ verification by professional experts. The purple start shows the epicenter. This map is prepared every so often that the population fill in new questionnaires. The number of questionnaires used to determine the map and the date and time of the last adjournment are shown in the upper right part of the panel.
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Md 1.7
ML 0.4
42.71 13.23 9 2014-10-21
Bollettino Sismico Italiano INGV 1343289
Preferred location and magnitude until now.
Origin information


Field Value
Time (UTC) 2012-02-25 00:17:41 ± 0.09
Latitude 42.71 ± 0.00
Longitude 13.23 ± 0.00
Depth (km) 9 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-SISPICK
Event type earthquake
Origin ID 1343289


Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 190
Semi-minor axis of confidence ellipse (meter) 75
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 230
Circular confidence region, given by single value of horizontal uncertainty (meter) 282.8
Confidence level of the uncertainty (%) 68


Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 169
Number of associated phases, regardless of their use for origin computation 7
Number of defining phases 6
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.06
Epicentral distance of station closest to the epicenter (degree) 0
Epicentral distance of station farthest from the epicenter (degree) 0.17537
Number of stations at which the event was observed 4
Number of stations from which data was used for origin computation 3
Magnitudes information


Field Value
Value 0.4
Uncertainty 0.1
Num. used stations
Type of magnitude ML
Reference to an origin 1343289
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-06 02:46:53


Field Value
Value 1.7
Uncertainty 0.1
Num. used stations
Type of magnitude Md
Reference to an origin 1343289
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-06 02:46:53
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.LNSS.HHN. 2012-02-25T00:17:49.37 0.6 undecidable manual Sg 234 0.1754 0.043 49
IV.FAGN.HHE. 2012-02-25T00:17:48.73 10.0 undecidable manual Pg 0 0 0
IV.NRCA.HHE. 2012-02-25T00:17:48.55 0.3 undecidable manual Sg 326 0.1538 -0.031 74
IV.SMA1.EHE. 2012-02-25T00:17:47.05 0.3 undecidable manual Sg 135 0.107 0.003 75
IV.LNSS.HHN. 2012-02-25T00:17:46.17 0.3 undecidable manual Pg 234 0.1754 -0.05 73
IV.NRCA.HHE. 2012-02-25T00:17:45.83 0.1 undecidable manual Pg 326 0.1538 0.041 98
IV.SMA1.EHE. 2012-02-25T00:17:44.90 0.1 undecidable manual Pg 135 0.107 -0.004 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.SMA1.EHN. ML:0.3 2.5E-5 0.18 AML other m 2012-02-25T00:17:44.90
IV.SMA1.EHE. Md:1.6 16.2 END duration s
IV.NRCA.HHN. ML:0.5 3.0E-5 0.1 AML other m 2012-02-25T00:17:45.83
IV.NRCA.HHE. Md:1.8 21.8 END duration s
IV.LNSS.HHN. Md:1.6 15.5 END duration s
IV.LNSS.HHE. ML:0.5 2.5E-5 0.36 AML other m 2012-02-25T00:17:46.17
IV.FAGN.HHN. ML:0 4.5E-5 0.52 AML other m 2012-02-25T00:17:48.73
IV.FAGN.HHE. Md:0 18.1 END duration s
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
Type Description Link
QuakeML - small Event, Origin, FocalMechanism Download
QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download