Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.6 on date 23-02-2021 and time 16:05:37 (UTC) in region 2 km SE Cerreto di Spoleto (PG)

A magnitude ML 1.6 earthquake occured in region: 2 km SE Cerreto di Spoleto (PG), on

  • 23-02-2021 16:05:37 (UTC)
  • 23-02-2021 17:05:37 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.8090, 12.9390 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 2 1075 1075
Vallo di Nera PG 8 364 1439
Sellano PG 9 1079 2518
Poggiodomo PG 11 117 2635
Preci PG 11 724 3359
Cascia PG 12 3217 6576
Sant'Anatolia di Narco PG 12 564 7140
Norcia PG 13 4957 12097
Campello sul Clitunno PG 13 2442 14539
Scheggino PG 14 461 15000
Trevi PG 17 8469 23469
Monteleone di Spoleto PG 18 599 24068
Visso MC 18 1107 25175
Spoleto PG 18 38218 63393

Municipalities with at least 50000 inhabitants

An earthquake occurred to
25 Km SE of Foligno (57155 inhabitants)
36 Km NE of Terni (111501 inhabitants)
56 Km SE of Perugia (166134 inhabitants)
63 Km NW of L'Aquila (69753 inhabitants)
65 Km W of Teramo (54892 inhabitants)
81 Km NE of Viterbo (67173 inhabitants)
92 Km N of Guidonia Montecelio (88673 inhabitants)
95 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 1.6 2021-02-23
16:05:37		 42.8093 12.9392 10 2021-07-12
16:55:00		 Bollettino Sismico Italiano INGV 87600761
Reviewed
Rev100 		ML 1.6 2021-02-23
16:05:37		 42.8088 12.9417 10 2021-02-23
16:20:41		 Sala Sismica INGV-Roma 87412161
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-02-23 16:05:37 ± 0.04
Latitude 42.8093 ± 0.0018
Longitude 12.9392 ± 0.0025
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 87600761

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 205
Semi-minor axis of confidence ellipse (meter) 151
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 98
Circular confidence region, given by single value of horizontal uncertainty (meter) 200.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 44
Number of associated phases, regardless of their use for origin computation 49
Number of defining phases 42
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.17
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.53330
Number of stations at which the event was observed 27
Number of stations from which data was used for origin computation 21
Magnitudes information

ML:1.6

Field Value
Value 1.6
Uncertainty 0.2
Num. used stations 12
Type of magnitude ML
Reference to an origin 87600761
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-03-01 12:03:39

ML:1.6

Field Value
Value 1.6
Uncertainty 0.3
Num. used stations 26
Type of magnitude ML
Reference to an origin 87412161
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-02-23 16:20:41
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.VIVA.HHZ. 2021-02-23T16:06:10.62 3.0 undecidable manual S -3.14 0
IV.RONT.HHZ. 2021-02-23T16:06:08.85 3.0 positive manual Pg 3.81 0
IV.ATLO.EHE. 2021-02-23T16:05:59.66 3.0 undecidable manual S 0.67 0
IV.EL6.EHZ. 2021-02-23T16:05:56.18 0.6 undecidable manual S 13 59.1963 50 0.34 44
IV.ATCC.EHZ. 2021-02-23T16:05:53.28 0.3 undecidable manual S 330 48.2184 50 0.36 67
IV.FAGN.HHZ. 2021-02-23T16:05:52.56 3.0 negative manual P 0.6 0
IV.PF6.EHE. 2021-02-23T16:05:51.09 0.3 undecidable manual S 30 41.9247 50 -0.14 71
IV.SMA1.EHZ. 2021-02-23T16:05:50.60 0.6 undecidable manual S 121 37.9287 50 0.44 45
IV.ATLO.EHE. 2021-02-23T16:05:50.11 3.0 undecidable manual P 0.26 0
IV.RM33.HNE. 2021-02-23T16:05:50.66 0.6 undecidable manual S 146 40.2264 50 -0.12 48
IV.CSP1.EHZ. 2021-02-23T16:05:50.31 0.3 undecidable manual S 34 38.0286 50 0.11 72
IV.T1299.HNE. 2021-02-23T16:05:49.33 0.3 undecidable manual S 125 34.0437 50 0.19 71
IV.CESX.HHZ. 2021-02-23T16:05:49.56 0.3 undecidable manual S 232 36.3414 50 -0.19 71
IV.MURB.HHZ. 2021-02-23T16:05:48.35 3.0 negative manual P 0.04 0
IV.MMO1.EHZ. 2021-02-23T16:05:48.74 0.3 undecidable manual S 72 33.0447 50 -0.13 72
IV.TERO.HHZ. 2021-02-23T16:05:48.06 3.0 positive manual P -0.19 0
IV.MOMA.HNZ. 2021-02-23T16:05:48.07 0.3 undecidable manual S 269 30.0477 50 0 75
IT.GNU.HGZ. 2021-02-23T16:05:48.00 0.3 undecidable manual S 269 30.0477 50 -0.06 74
IV.MML1.EHE. 2021-02-23T16:05:48.88 0.3 undecidable manual S 4 33.8439 50 -0.2 71
IV.ARRO.EHZ. 2021-02-23T16:05:47.60 0.3 undecidable manual S 209 29.2485 50 -0.24 71
IV.EL6.EHZ. 2021-02-23T16:05:47.99 0.3 undecidable manual P 13 59.1963 50 -0.02 70
IT.FOPC.HGZ. 2021-02-23T16:05:47.08 0.6 undecidable manual S 313 26.1516 111 0.05 50
IV.ATCC.EHZ. 2021-02-23T16:05:46.28 0.3 undecidable manual P 330 48.2184 50 -0.05 71
IV.MC2.EHZ. 2021-02-23T16:05:46.22 0.3 undecidable manual S 61 23.2545 113 0.13 74
IV.LNSS.HHZ. 2021-02-23T16:05:46.15 0.3 undecidable manual S 160 24.3534 112 -0.3 71
IT.MTCL.HGZ. 2021-02-23T16:05:45.03 0.3 undecidable manual S 13 21.0678 115 -0.36 70
IV.CESI.HHZ. 2021-02-23T16:05:45.53 0.3 undecidable manual S 353 21.867 114 -0.12 74
IV.PF6.EHE. 2021-02-23T16:05:45.25 0.3 undecidable manual P 30 41.9247 50 -0.1 71
IV.MOMA.HNZ. 2021-02-23T16:05:44.01 0.3 undecidable manual P 269 30.0477 50 0.49 67
IV.RM33.HNE. 2021-02-23T16:05:44.94 0.1 undecidable manual P 146 40.2264 50 -0.15 95
IV.MML1.EHE. 2021-02-23T16:05:44.08 0.3 undecidable manual P 4 33.8439 50 -0.03 74
IV.CSP1.EHZ. 2021-02-23T16:05:44.65 0.1 undecidable manual P 34 38.0286 50 -0.11 96
IV.T1299.HNE. 2021-02-23T16:05:44.18 0.3 undecidable manual P 125 34.0437 50 0.04 74
IV.SMA1.EHZ. 2021-02-23T16:05:44.92 0.3 undecidable manual P 121 37.9287 50 0.19 71
IV.CESX.HHZ. 2021-02-23T16:05:44.20 0.3 undecidable manual P 232 36.3414 50 -0.3 69
IV.FEMA.HNZ. 2021-02-23T16:05:44.74 0.3 undecidable manual S 28 19.1697 117 -0.07 75
IT.GNU.HGZ. 2021-02-23T16:05:43.92 0.6 undecidable manual P 269 30.0477 50 0.4 46
IV.NRCA.HHZ. 2021-02-23T16:05:43.44 0.3 undecidable manual S 79 14.4744 124 0.03 76
IV.ARRO.EHZ. 2021-02-23T16:05:43.34 0.1 undecidable manual P 209 29.2485 50 -0.06 98
IV.GAVE.EHZ. 2021-02-23T16:05:43.21 0.3 undecidable manual S 196 13.4754 126 0.08 76
IV.MMO1.EHZ. 2021-02-23T16:05:43.84 0.3 undecidable manual P 72 33.0447 50 -0.15 72
IV.MC2.EHZ. 2021-02-23T16:05:42.45 0.1 undecidable manual P 61 23.2545 113 0.06 99
IV.LNSS.HHZ. 2021-02-23T16:05:42.47 0.1 undecidable manual P 160 24.3534 112 -0.12 98
IV.CESI.HHZ. 2021-02-23T16:05:42.18 0.1 undecidable manual P 353 21.867 114 0.05 100
IT.FOPC.HGZ. 2021-02-23T16:05:42.92 0.6 undecidable manual P 313 26.1516 111 0 50
IV.GAVE.EHZ. 2021-02-23T16:05:41.03 0.1 positive manual P 196 13.4754 126 0.35 95
IV.FEMA.HNZ. 2021-02-23T16:05:41.76 0.3 undecidable manual P 28 19.1697 117 0.12 74
IT.MTCL.HGZ. 2021-02-23T16:05:41.93 0.1 undecidable manual P 13 21.0678 115 -0.05 100
IV.NRCA.HHZ. 2021-02-23T16:05:40.97 0.1 undecidable manual P 79 14.4744 124 0.13 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.CESI.HHN. ML:2.0 0.0006020000000000001 0.24 AML other m 2021-02-23T16:05:45.79
IV.CESI.HHE. ML:1.5 0.00022462065 0.1024 AML other m 2021-02-23T16:05:45.91
IV.CESI.HNN. ML:2.0 0.0005989177500000001 0.256 AML other m 2021-02-23T16:05:45.79
IV.CESI.HNE. ML:1.4 0.00018724844000000002 0.1024 AML other m 2021-02-23T16:05:45.93
IV.CSP1.EHN. ML:1.5 0.00011270971499999998 0.1152 AML other m 2021-02-23T16:05:51.49
IV.CSP1.EHE. ML:1.6 0.00013505 0.28 AML other m 2021-02-23T16:05:53.21
IV.ATCC.EHE. ML:1.5 0.000078022515 0.1408 AML other m 2021-02-23T16:05:53.70
IV.ATCC.EHN. ML:1.4 0.000067 0.12 AML other m 2021-02-23T16:05:54.71
IV.EL6.EHE. ML:1.5 0.000063497305 0.256 AML other m 2021-02-23T16:05:57.47
IV.EL6.EHN. ML:1.5 0.00007145364499999999 0.2176 AML other m 2021-02-23T16:05:58.36
IV.MURB.HHN. ML:1.5 0.000058800000000000006 0.28 AML other m 2021-02-23T16:06:00.37
IV.MURB.HHE. ML:1.5 0.00006768465500000001 0.2432 AML other m 2021-02-23T16:06:00.70
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