Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.2 on date 25-01-2021 and time 23:27:31 (Italy) in region 3 km W Stroncone (TR)

A magnitude ML 1.2 earthquake occured in region: 3 km W Stroncone (TR), on

  • 25-01-2021 22:27:31 (UTC)
  • 25-01-2021 23:27:31 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.4860, 12.6300 at 9 km depth.

The earthquake was located by: Sala Sismica INGV-Roma.

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

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
Stroncone TR 3 4917 4917
Configni RI 7 633 5550
Terni TR 9 111501 117051
Cottanello RI 10 563 117614
Narni TR 10 19785 137399
Calvi dell'Umbria TR 11 1856 139255
Vacone RI 11 256 139511
Montasola RI 12 395 139906
Greccio RI 12 1558 141464
Colli sul Velino RI 12 533 141997
Montebuono RI 14 883 142880
Contigliano RI 14 3783 146663
Otricoli TR 14 1869 148532
Torri in Sabina RI 15 1256 149788
Tarano RI 15 1444 151232
Labro RI 15 374 151606
Arrone TR 16 2763 154369
San Gemini TR 16 5018 159387
Casperia RI 17 1246 160633
Montefranco TR 17 1276 161909
Morro Reatino RI 17 373 162282
Collevecchio RI 18 1577 163859
Magliano Sabina RI 18 3774 167633
Selci RI 18 1106 168739
Rivodutri RI 19 1253 169992
Roccantica RI 19 563 170555
Amelia TR 20 11897 182452
Cantalupo in Sabina RI 20 1685 184137
Ferentillo TR 20 1913 186050

Municipalities with at least 50000 inhabitants

An earthquake occurred to
9 Km S of Terni (111501 inhabitants)
44 Km E of Viterbo (67173 inhabitants)
53 Km S of Foligno (57155 inhabitants)
55 Km N of Guidonia Montecelio (88673 inhabitants)
60 Km N of Tivoli (56533 inhabitants)
65 Km W of L'Aquila (69753 inhabitants)
67 Km N of Roma (2864731 inhabitants)
72 Km S of Perugia (166134 inhabitants)
82 Km NE of Civitavecchia (52991 inhabitants)
86 Km NE of Fiumicino (78395 inhabitants)
90 Km N of Velletri (53303 inhabitants)
90 Km W of Teramo (54892 inhabitants)
91 Km N of Pomezia (62966 inhabitants)
99 Km N of Aprilia (73446 inhabitants)
Recent and historical seismicity
Seismic hazard
Shakemap
Felt maps
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Reviewed
Rev100 		ML 1.2 2021-01-25
22:27:31		 42.4863 12.6302 9 2021-01-25
22:39:53		 Sala Sismica INGV-Roma 86577811
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-01-25 22:27:31 ± 0.12
Latitude 42.4863 ± 0.0054
Longitude 12.6302 ± 0.0098
Depth (km) 9 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 86577811

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 744
Semi-minor axis of confidence ellipse (meter) 555
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 301
Circular confidence region, given by single value of horizontal uncertainty (meter) 740.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 64
Number of associated phases, regardless of their use for origin computation 19
Number of defining phases 17
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.28
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.64212
Number of stations at which the event was observed 14
Number of stations from which data was used for origin computation 12
Magnitude information

ML:1.2

Field Value
Value 1.2
Uncertainty 0.2
Num. used stations 19
Type of magnitude ML
Reference to an origin 86577811
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-01-25 22:39:53
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.FDMO.HHZ. 2021-01-25T22:27:54.52 3.0 undecidable manual S -0.23 0
IV.SACS.HNE. 2021-01-25T22:27:45.31 0.6 undecidable manual P 305 71.2731 50 0.84 36
IV.MGAB.HNE. 2021-01-25T22:27:44.08 0.6 undecidable manual P 318 63.3921 50 0.81 37
IV.LNSS.HHZ. 2021-01-25T22:27:44.75 0.3 undecidable manual S 69 35.9418 50 0.47 66
IV.GAVE.EHZ. 2021-01-25T22:27:43.30 0.3 undecidable manual S 43 31.4463 50 0.22 70
IV.MOMA.HHZ. 2021-01-25T22:27:43.89 0.3 undecidable manual S 352 35.5422 50 -0.3 69
IV.CESI.HHZ. 2021-01-25T22:27:43.06 3.0 negative manual P 0.01 0
IV.SRES.HHZ. 2021-01-25T22:27:42.39 0.3 undecidable manual S 200 29.3484 50 -0.14 72
IV.NRCA.HHZ. 2021-01-25T22:27:41.77 0.1 undecidable manual P 46 55.2003 50 -0.23 90
IV.BARO.HNE. 2021-01-25T22:27:41.92 1.0 undecidable manual P 241 54.3012 50 0.05 23
IV.FIAM.HNN. 2021-01-25T22:27:40.46 0.3 undecidable manual P 121 46.7199 50 -0.23 68
IV.LNSS.HHZ. 2021-01-25T22:27:38.82 0.1 undecidable manual P 69 35.9418 50 -0.22 93
IT.MMP1.HGZ. 2021-01-25T22:27:38.08 0.6 undecidable manual P 160 28.0497 109 0.29 47
IV.SRES.HHZ. 2021-01-25T22:27:38.02 0.1 undecidable manual P 200 29.3484 50 0 98
IV.GAVE.EHZ. 2021-01-25T22:27:38.30 0.1 undecidable manual P 43 31.4463 50 -0.04 97
IV.MOMA.HHZ. 2021-01-25T22:27:38.57 0.1 undecidable manual P 352 35.5422 50 -0.41 90
IV.CESX.HHZ. 2021-01-25T22:27:37.76 0.3 undecidable manual S 345 13.9749 124 0.03 76
IV.CESX.HHZ. 2021-01-25T22:27:35.20 0.1 undecidable manual P 345 13.9749 124 -0.05 100
IV.ARRO.EHZ. 2021-01-25T22:27:35.51 0.1 undecidable manual P 47 15.1737 122 0.07 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.CESX.HHN. ML:1.2 0.000183 0.32 AML other m 2021-01-25T22:27:38.04
IV.ARRO.EHN. ML:1.2 0.000162881945 0.2432 AML other m 2021-01-25T22:27:39.55
IV.ARRO.EHE. ML:1.2 0.000143637455 0.2048 AML other m 2021-01-25T22:27:39.80
IV.CESX.HHE. ML:1.2 0.0001615163 0.32 AML other m 2021-01-25T22:27:39.56
IV.MOMA.HHN. ML:1.3 0.00008305000000000001 0.64 AML other m 2021-01-25T22:27:44.53
IV.MOMA.HHE. ML:1.3 0.000086364045 0.3456 AML other m 2021-01-25T22:27:45.87
IV.GAVE.EHN. ML:1.2 0.00007835680000000001 0.1792 AML other m 2021-01-25T22:27:45.50
IV.GAVE.EHE. ML:1.2 0.00007435322499999999 0.128 AML other m 2021-01-25T22:27:46.54
IV.SRES.HHE. ML:0.8 0.000034569945 0.1536 AML other m 2021-01-25T22:27:44.11
IV.SRES.HHN. ML:0.8 0.000035929425000000004 0.2048 AML other m 2021-01-25T22:27:43.69
IV.GAVE.HNE. ML:1.5 0.00014119805000000003 0 AML other m 2021-01-25T22:27:45.24
IV.LNSS.HNE. ML:1.3 0.000075991115 0.1408 AML other m 2021-01-25T22:27:45.15
IV.LNSS.HNN. ML:1.4 0.00008913357999999999 0.8064 AML other m 2021-01-25T22:27:45.08
IV.LNSS.HHE. ML:1.2 0.000065777675 0.1408 AML other m 2021-01-25T22:27:45.14
IV.LNSS.HHN. ML:1.2 0.000062823945 0.1152 AML other m 2021-01-25T22:27:45.94
IV.NRCA.HHE. ML:1.3 0.00004817271 0.1152 AML other m 2021-01-25T22:27:52.60
IV.NRCA.HHN. ML:1.1 0.000028177151 0.1792 AML other m 2021-01-25T22:27:50.59
IV.CESI.HHE. ML:0.9 0.000015037060000000001 0.1152 AML other m 2021-01-25T22:27:53.84
IV.CESI.HHN. ML:1.0 0.000018522364999999998 0.2048 AML other m 2021-01-25T22:27:53.46
TDMT - Time Domain Moment Tensor
Fault Plane solutions in the area
Download
Type Description Link
QuakeML - small Event, Origin, FocalMechanism Download
QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download