Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.5 on date 11-02-2021 and time 18:31:56 (Italy) in region 1 km NE Spoleto (PG)

A magnitude ML 1.5 earthquake occured in region: 1 km NE Spoleto (PG), on

  • 11-02-2021 17:31:56 (UTC)
  • 11-02-2021 18:31:56 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.7420, 12.7470 at 10 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

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
Spoleto PG 1 38218 38218
Sant'Anatolia di Narco PG 7 564 38782
Scheggino PG 8 461 39243
Campello sul Clitunno PG 9 2442 41685
Vallo di Nera PG 10 364 42049
Castel Ritaldi PG 11 3278 45327
Ferentillo TR 14 1913 47240
Trevi PG 15 8469 55709
Poggiodomo PG 16 117 55826
Montefranco TR 16 1276 57102
Cerreto di Spoleto PG 16 1075 58177
Giano dell'Umbria PG 17 3846 62023
Acquasparta TR 17 4778 66801
Arrone TR 18 2763 69564
Montefalco PG 19 5679 75243
Massa Martana PG 19 3770 79013
Polino TR 19 233 79246
Monteleone di Spoleto PG 20 599 79845

Municipalities with at least 50000 inhabitants

An earthquake occurred to
22 Km NE of Terni (111501 inhabitants)
24 Km S of Foligno (57155 inhabitants)
50 Km SE of Perugia (166134 inhabitants)
64 Km NE of Viterbo (67173 inhabitants)
69 Km NW of L'Aquila (69753 inhabitants)
79 Km W of Teramo (54892 inhabitants)
82 Km N of Guidonia Montecelio (88673 inhabitants)
87 Km N of Tivoli (56533 inhabitants)
97 Km N of Roma (2864731 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
Bulletin
Rev1000 		ML 1.5 2021-02-11
17:31:56		 42.7422 12.7473 10 2021-07-12
16:55:11		 Bollettino Sismico Italiano INGV 90061001
Reviewed
Rev100 		ML 1.5 2021-02-11
17:31:56		 42.7383 12.7447 10 2021-02-11
18:10:59		 Sala Sismica INGV-Roma 87054371
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-02-11 17:31:56 ± 0.05
Latitude 42.7422 ± 0.0036
Longitude 12.7473 ± 0.0049
Depth (km) 10 ± 0 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 90061001

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 430
Semi-minor axis of confidence ellipse (meter) 275
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 226
Circular confidence region, given by single value of horizontal uncertainty (meter) 430.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 73
Number of associated phases, regardless of their use for origin computation 28
Number of defining phases 25
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.18
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.64122
Number of stations at which the event was observed 15
Number of stations from which data was used for origin computation 13
Magnitudes information

ML:1.5

Field Value
Value 1.5
Uncertainty 0.1
Num. used stations 14
Type of magnitude ML
Reference to an origin 87054371
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-02-11 18:10:59

ML:1.5

Field Value
Value 1.5
Uncertainty 0.1
Num. used stations 14
Type of magnitude ML
Reference to an origin 90061001
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-05-13 18:55:36
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.FIR.HHZ. 2021-02-11T17:32:44.52 3.0 undecidable manual S 0.02 0
IV.EL6.EHZ. 2021-02-11T17:32:19.60 3.0 undecidable manual S 71.1732 1.18 0
IV.CSP1.EHZ. 2021-02-11T17:32:14.10 0.3 undecidable manual S 44 53.7018 50 0.34 66
IV.SMA1.EHN. 2021-02-11T17:32:13.46 0.6 undecidable manual S 104 49.5171 50 0.82 37
IV.MC2.EHZ. 2021-02-11T17:32:10.40 0.6 undecidable manual S 62 40.5261 50 0.16 47
IV.EL6.EHZ. 2021-02-11T17:32:09.66 3.0 undecidable manual P 71.1732 0.4 0
IV.ASSB.HHZ. 2021-02-11T17:32:08.60 0.3 undecidable manual S 348 34.1436 50 0.08 72
IV.CESI.HHE. 2021-02-11T17:32:07.85 0.3 undecidable manual S 24 31.8459 50 -0.06 72
IV.NRCA.HHZ. 2021-02-11T17:32:07.60 0.1 undecidable manual S 71 31.5462 50 -0.24 93
IV.LNSS.HHZ. 2021-02-11T17:32:06.70 0.1 undecidable manual S 123 28.4493 50 -0.32 92
IV.CSP1.EHZ. 2021-02-11T17:32:06.61 0.3 undecidable manual P 44 53.7018 50 0.04 70
IV.RM33.EHZ. 2021-02-11T17:32:05.30 0.1 undecidable manual P 124 46.1205 50 -0.09 94
IV.SMA1.EHN. 2021-02-11T17:32:05.71 0.6 undecidable manual P 104 49.5171 50 -0.21 45
IV.CESX.HHZ. 2021-02-11T17:32:04.50 0.3 undecidable manual S 222 19.7691 117 0.04 74
IV.ARRO.EHZ. 2021-02-11T17:32:04.20 0.6 undecidable manual S 175 18.1707 119 0.24 48
IV.MC2.EHZ. 2021-02-11T17:32:04.77 1.0 undecidable manual P 62 40.5261 50 0.23 23
IV.MOMA.HHZ. 2021-02-11T17:32:03.10 0.1 undecidable manual S 295 15.9729 122 -0.21 96
IV.ASSB.HHZ. 2021-02-11T17:32:03.61 0.3 undecidable manual P 348 34.1436 50 0.06 72
IV.CESI.HHE. 2021-02-11T17:32:03.16 0.3 undecidable manual P 24 31.8459 50 -0.04 73
IT.GNU.HGZ. 2021-02-11T17:32:03.20 0.6 undecidable manual S 295 15.9729 122 -0.11 49
IV.NRCA.HHZ. 2021-02-11T17:32:03.10 0.1 undecidable manual P 71 31.5462 50 -0.05 97
IV.LNSS.HHZ. 2021-02-11T17:32:02.57 0.1 undecidable manual P 123 28.4493 50 -0.11 96
IV.GAVE.EHZ. 2021-02-11T17:32:02.40 0.1 undecidable manual S 115 13.1757 127 -0.12 99
IV.ARRO.EHZ. 2021-02-11T17:32:01.17 0.3 undecidable manual P 175 18.1707 119 0.26 71
IV.CESX.HHZ. 2021-02-11T17:32:01.18 0.1 undecidable manual P 222 19.7691 117 -0.02 100
IV.MOMA.HHZ. 2021-02-11T17:32:00.57 0.1 undecidable manual P 295 15.9729 122 0.03 100
IV.GAVE.EHZ. 2021-02-11T17:32:00.16 0.1 undecidable manual P 115 13.1757 127 0.08 100
IT.GNU.HGZ. 2021-02-11T17:32:00.74 0.6 undecidable manual P 295 15.9729 122 0.2 48
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.GAVE.EHN. ML:1.3 0.000217 1.5 AML other m 2021-02-11T17:32:03.85
IV.GAVE.EHE. ML:1.5 0.00034199999999999996 1.58 AML other m 2021-02-11T17:32:03.91
IV.MOMA.HHE. ML:1.6 0.00034899999999999997 0.72 AML other m 2021-02-11T17:32:03.58
IV.MOMA.HNE. ML:1.6 0.00036350000000000005 0.7 AML other m 2021-02-11T17:32:03.59
IV.MOMA.HHN. ML:1.6 0.000354 0.18 AML other m 2021-02-11T17:32:03.62
IV.MOMA.HNN. ML:1.6 0.0003415 0.94 AML other m 2021-02-11T17:32:04.53
IV.ARRO.EHE. ML:1.2 0.0001435 0.72 AML other m 2021-02-11T17:32:04.99
IV.CESX.HHN. ML:1.4 0.000199 0.88 AML other m 2021-02-11T17:32:05.99
IV.ARRO.EHN. ML:1.1 0.00010895 0.16 AML other m 2021-02-11T17:32:05.66
IV.CESX.HHE. ML:1.4 0.00020050000000000002 1.6 AML other m 2021-02-11T17:32:05.01
IV.LNSS.HHN. ML:1.4 0.00013900000000000002 1.06 AML other m 2021-02-11T17:32:07.61
IV.LNSS.HHE. ML:1.6 0.000178 0.36 AML other m 2021-02-11T17:32:07.84
IV.NRCA.HHN. ML:1.5 0.0001325 1.28 AML other m 2021-02-11T17:32:08.03
IV.NRCA.HHE. ML:1.5 0.00014050000000000003 0.34 AML other m 2021-02-11T17:32:09.82
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