Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.7 on date 23-01-2021 and time 12:04:19 (Italy) in region 5 km NE Cerreto di Spoleto (PG)

A magnitude ML 1.7 earthquake occured in region: 5 km NE Cerreto di Spoleto (PG), on

  • 23-01-2021 11:04:19 (UTC)
  • 23-01-2021 12:04:19 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.8520, 12.9540 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
Cerreto di Spoleto PG 5 1075 1075
Sellano PG 5 1079 2154
Preci PG 8 724 2878
Vallo di Nera PG 12 364 3242
Norcia PG 13 4957 8199
Visso MC 14 1107 9306
Campello sul Clitunno PG 15 2442 11748
Cascia PG 16 3217 14965
Poggiodomo PG 16 117 15082
Sant'Anatolia di Narco PG 16 564 15646
Monte Cavallo MC 16 145 15791
Trevi PG 17 8469 24260
Castelsantangelo sul Nera MC 17 281 24541
Ussita MC 18 444 24985
Scheggino PG 18 461 25446

Municipalities with at least 50000 inhabitants

An earthquake occurred to
23 Km SE of Foligno (57155 inhabitants)
41 Km NE of Terni (111501 inhabitants)
54 Km SE of Perugia (166134 inhabitants)
65 Km W of Teramo (54892 inhabitants)
67 Km NW of L'Aquila (69753 inhabitants)
85 Km NE of Viterbo (67173 inhabitants)
97 Km N of Guidonia Montecelio (88673 inhabitants)
97 Km SW of Ancona (100861 inhabitants)
100 Km N of Tivoli (56533 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 1.7 2021-01-23
11:04:19		 42.8523 12.9538 10 2021-07-12
16:54:57		 Bollettino Sismico Italiano INGV 86799631
Reviewed
Rev100 		ML 1.7 2021-01-23
11:04:19		 42.8522 12.9518 10 2021-01-23
11:08:55		 Sala Sismica INGV-Roma 86490101
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-01-23 11:04:19 ± 0.05
Latitude 42.8523 ± 0.0027
Longitude 12.9538 ± 0.0037
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 86799631

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 291
Semi-minor axis of confidence ellipse (meter) 259
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 44
Circular confidence region, given by single value of horizontal uncertainty (meter) 290.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 83
Number of associated phases, regardless of their use for origin computation 30
Number of defining phases 28
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.15
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.39390
Number of stations at which the event was observed 16
Number of stations from which data was used for origin computation 14
Magnitudes information

ML:1.7

Field Value
Value 1.7
Uncertainty 0.2
Num. used stations 8
Type of magnitude ML
Reference to an origin 86799631
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-03-05 15:47:54

ML:1.7

Field Value
Value 1.7
Uncertainty 0.2
Num. used stations 8
Type of magnitude ML
Reference to an origin 86490101
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-01-23 11:08:55
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.PE3.EHZ. 2021-01-23T11:04:49.07 3.0 undecidable manual S -0.35 0
IV.EL6.EHZ. 2021-01-23T11:04:37.12 3.0 undecidable manual S -0.28 0
IV.MF5.EHZ. 2021-01-23T11:04:34.56 1.0 undecidable manual S 70 43.7229 50 0.73 20
IV.CESX.HHZ. 2021-01-23T11:04:33.00 1.0 undecidable manual S 228 40.3263 50 0.09 24
IV.RM33.EHZ. 2021-01-23T11:04:33.76 0.6 undecidable manual S 151 43.623 50 -0.03 48
IV.GUMA.HHZ. 2021-01-23T11:04:32.64 0.6 undecidable manual S 53 38.7279 50 0.14 47
IV.MMO1.EHZ. 2021-01-23T11:04:30.14 0.3 undecidable manual S 80 30.747 50 -0.22 71
IV.ASSB.HHZ. 2021-01-23T11:04:30.69 0.3 undecidable manual S 311 31.9458 50 0.02 73
IV.CSP1.EHZ. 2021-01-23T11:04:30.79 0.6 undecidable manual S 37 33.4443 50 -0.29 46
IV.MML1.HNZ. 2021-01-23T11:04:29.97 0.6 undecidable manual S 3 29.0487 50 0.08 49
IV.MF5.EHZ. 2021-01-23T11:04:28.06 0.1 undecidable manual P 70 43.7229 50 0.29 91
IV.RM33.EHZ. 2021-01-23T11:04:27.67 0.1 undecidable manual P 151 43.623 50 -0.07 95
IV.FDMO.HHZ. 2021-01-23T11:04:27.87 0.6 undecidable manual S 28 23.1546 114 -0.38 46
IV.CESX.HHZ. 2021-01-23T11:04:27.14 0.1 undecidable manual P 228 40.3263 50 -0.1 95
IV.GUMA.HHZ. 2021-01-23T11:04:27.18 0.1 undecidable manual P 53 38.7279 50 0.18 94
IV.MC2.EHZ. 2021-01-23T11:04:27.42 0.6 undecidable manual S 71 20.1687 117 0.09 49
IV.CESI.HHZ. 2021-01-23T11:04:26.50 0.6 undecidable manual S 347 17.3715 120 0.02 50
IV.CSP1.EHZ. 2021-01-23T11:04:26.11 0.3 undecidable manual P 37 33.4443 50 -0.07 72
IT.MTCL.HGZ. 2021-01-23T11:04:25.91 0.6 undecidable manual S 13 16.1727 122 -0.19 49
IV.ASSB.HHZ. 2021-01-23T11:04:25.87 0.3 undecidable manual P 311 31.9458 50 -0.08 73
IV.FEMA.HNZ. 2021-01-23T11:04:25.66 0.6 undecidable manual S 33 14.4744 125 0.04 50
IV.MML1.HNZ. 2021-01-23T11:04:25.41 0.1 undecidable manual P 3 29.0487 50 -0.09 97
IV.NRCA.HHZ. 2021-01-23T11:04:25.10 0.3 undecidable manual S 99 13.1757 128 -0.17 74
IV.MMO1.EHZ. 2021-01-23T11:04:25.60 0.3 undecidable manual P 80 30.747 50 -0.16 71
IV.FDMO.HHZ. 2021-01-23T11:04:24.47 0.1 positive manual P 28 23.1546 114 -0.08 98
IV.MC2.EHZ. 2021-01-23T11:04:24.09 0.3 undecidable manual P 71 20.1687 117 0.07 74
IT.MTCL.HGZ. 2021-01-23T11:04:23.36 0.1 undecidable manual P 13 16.1727 122 0.05 100
IV.CESI.HHZ. 2021-01-23T11:04:23.67 0.1 undecidable manual P 347 17.3715 120 0.15 98
IV.FEMA.HNZ. 2021-01-23T11:04:23.22 0.3 undecidable manual P 33 14.4744 125 0.19 73
IV.NRCA.HHZ. 2021-01-23T11:04:22.92 0.1 negative manual P 99 13.1757 128 0.09 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.NRCA.HHN. ML:1.9 0.0008489999999999999 0.08 AML other m 2021-01-23T11:04:25.21
IV.NRCA.HNN. ML:1.9 0.00078 0.08 AML other m 2021-01-23T11:04:25.21
IV.NRCA.HNE. ML:1.8 0.000744 0.12 AML other m 2021-01-23T11:04:25.28
IV.NRCA.HHE. ML:1.9 0.0008300000000000001 0.12 AML other m 2021-01-23T11:04:25.28
IV.CESI.HHN. ML:1.6 0.0003545 0.36 AML other m 2021-01-23T11:04:26.81
IV.CESI.HHE. ML:1.4 0.0002055 0.78 AML other m 2021-01-23T11:04:27.47
IV.FDMO.HHN. ML:1.4 0.00017199999999999998 0.78 AML other m 2021-01-23T11:04:28.49
IV.FDMO.HHE. ML:1.6 0.000252 0.7 AML other m 2021-01-23T11:04:28.13
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