Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 0.9 on date 31-01-2021 and time 04:39:53 (Italy) in region 3 km NE Cerreto di Spoleto (PG)

A magnitude ML 0.9 earthquake occured in region: 3 km NE Cerreto di Spoleto (PG), on

  • 31-01-2021 03:39:53 (UTC)
  • 31-01-2021 04:39:53 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.8380, 12.9390 at 10 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
Cerreto di Spoleto PG 3 1075 1075
Sellano PG 6 1079 2154
Preci PG 9 724 2878
Vallo di Nera PG 10 364 3242
Campello sul Clitunno PG 13 2442 5684
Norcia PG 14 4957 10641
Poggiodomo PG 14 117 10758
Sant'Anatolia di Narco PG 14 564 11322
Cascia PG 15 3217 14539
Visso MC 16 1107 15646
Trevi PG 16 8469 24115
Scheggino PG 16 461 24576
Monte Cavallo MC 18 145 24721
Castelsantangelo sul Nera MC 19 281 25002
Spoleto PG 20 38218 63220

Municipalities with at least 50000 inhabitants

An earthquake occurred to
23 Km SE of Foligno (57155 inhabitants)
39 Km NE of Terni (111501 inhabitants)
54 Km SE of Perugia (166134 inhabitants)
66 Km W of Teramo (54892 inhabitants)
66 Km NW of L'Aquila (69753 inhabitants)
83 Km NE of Viterbo (67173 inhabitants)
95 Km N of Guidonia Montecelio (88673 inhabitants)
98 Km N of Tivoli (56533 inhabitants)
99 Km SW of Ancona (100861 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 0.9 2021-01-31
03:39:53		 42.8382 12.9393 10 2021-01-31
03:48:40		 Sala Sismica INGV-Roma 86729441
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-01-31 03:39:53 ± 0.04
Latitude 42.8382 ± 0.0018
Longitude 12.9393 ± 0.0037
Depth (km) 10 ± 0 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 86729441

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 256
Semi-minor axis of confidence ellipse (meter) 150
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 79
Circular confidence region, given by single value of horizontal uncertainty (meter) 260.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 70
Number of associated phases, regardless of their use for origin computation 26
Number of defining phases 26
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.16
Epicentral distance of station closest to the epicenter (degree) 0.12860
Epicentral distance of station farthest from the epicenter (degree) 0.35703
Number of stations at which the event was observed 13
Number of stations from which data was used for origin computation 13
Magnitude information

ML:0.9

Field Value
Value 0.9
Uncertainty 0.3
Num. used stations 10
Type of magnitude ML
Reference to an origin 86729441
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-01-31 03:48:40
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.SMA1.EHE. 2021-01-31T03:40:07.55 0.6 undecidable manual S 125 39.627 50 0.34 45
IV.T1299.EHZ. 2021-01-31T03:40:06.38 0.1 undecidable manual S 129 35.9418 50 0.16 94
IV.CSP1.EHZ. 2021-01-31T03:40:06.07 0.3 undecidable manual S 37 35.4423 50 -0.02 72
IV.MOMA.HHE. 2021-01-31T03:40:05.01 0.6 undecidable manual S 263 30.2475 50 0.29 46
IV.ASSB.HHZ. 2021-01-31T03:40:05.06 0.3 undecidable manual S 315 32.1456 50 -0.15 71
IV.MML1.HNE. 2021-01-31T03:40:04.75 0.1 undecidable manual S 5 30.6471 50 -0.06 97
IV.FDMO.HHZ. 2021-01-31T03:40:03.01 0.1 undecidable manual S 29 25.0527 112 -0.28 93
IV.LNSS.HHZ. 2021-01-31T03:40:03.48 0.1 undecidable manual S 162 27.3504 50 -0.45 90
IV.MC2.EHZ. 2021-01-31T03:40:02.45 0.1 undecidable manual S 68 21.867 115 0.19 96
IT.MTCL.HGZ. 2021-01-31T03:40:01.03 0.3 undecidable manual S 16 17.9709 119 -0.02 75
IV.SMA1.EHE. 2021-01-31T03:40:01.99 1.0 undecidable manual P 125 39.627 50 0.4 22
IV.T1299.EHZ. 2021-01-31T03:40:01.16 0.3 undecidable manual P 129 35.9418 50 0.14 71
IV.CESI.HHZ. 2021-01-31T03:40:01.32 0.1 undecidable manual S 351 18.7701 118 0.04 99
IV.ASSB.HHZ. 2021-01-31T03:40:00.52 0.1 undecidable manual P 315 32.1456 50 0.08 96
IV.MML1.HNE. 2021-01-31T03:40:00.24 0.1 undecidable manual P 5 30.6471 50 0.03 97
IV.GAVE.EHZ. 2021-01-31T03:40:00.52 0.1 undecidable manual S 193 16.5723 121 -0.12 98
IV.CSP1.EHZ. 2021-01-31T03:40:00.89 0.6 undecidable manual P 37 35.4423 50 -0.06 48
IV.MOMA.HHE. 2021-01-31T03:40:00.25 0.6 undecidable manual P 263 30.2475 50 0.09 48
IV.NRCA.HNN. 2021-01-31T03:39:59.89 0.1 undecidable manual S 92 14.2746 125 -0.06 99
IV.FDMO.HHZ. 2021-01-31T03:39:59.24 0.6 negative manual P 29 25.0527 112 -0.09 49
IV.LNSS.HHZ. 2021-01-31T03:39:59.51 0.3 negative manual P 162 27.3504 50 -0.19 71
IV.CESI.HHZ. 2021-01-31T03:39:58.33 0.3 positive manual P 351 18.7701 118 0.16 73
IT.MTCL.HGZ. 2021-01-31T03:39:58.06 0.1 undecidable manual P 16 17.9709 119 0.02 100
IV.MC2.EHZ. 2021-01-31T03:39:58.69 0.3 undecidable manual P 68 21.867 115 -0.05 74
IV.NRCA.HNN. 2021-01-31T03:39:57.44 0.1 undecidable manual P 92 14.2746 125 0.04 100
IV.GAVE.EHZ. 2021-01-31T03:39:57.95 0.1 positive manual P 193 16.5723 121 0.15 97
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.FDMO.HHE. ML:0.4 0.00001469370285 0.1408 AML other m 2021-01-31T03:40:03.50
IV.FDMO.HHN. ML:0.6 0.0000236292282 44.4592 AML other m 2021-01-31T03:39:58.93
IV.GAVE.EHE. ML:1.1 0.00011971045 0.1184 AML other m 2021-01-31T03:40:00.89
IV.GAVE.EHN. ML:1.0 0.00008369509499999999 0.16 AML other m 2021-01-31T03:40:01.20
IV.GAVE.HNE. ML:1.2 0.000134662935 0.1408 AML other m 2021-01-31T03:40:00.89
IV.GAVE.HNN. ML:1.2 0.00015435424 0.6688 AML other m 2021-01-31T03:40:01.11
IV.CESI.HHE. ML:0.5 0.000022850349999999997 0.1008 AML other m 2021-01-31T03:40:01.69
IV.CESI.HHN. ML:0.7 0.00004193642 0.28 AML other m 2021-01-31T03:40:01.52
IV.LNSS.HHE. ML:1.1 0.000071767345 0.1008 AML other m 2021-01-31T03:40:04.08
IV.LNSS.HHN. ML:0.9 0.000040398114999999996 0.08 AML other m 2021-01-31T03:40:03.58
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