Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 0.7 on date 18-09-2021 and time 08:42:33 (UTC) in region 3 km NE Cerreto di Spoleto (PG)

A magnitude ML 0.7 earthquake occured in region: 3 km NE Cerreto di Spoleto (PG), on

  • 18-09-2021 08:42:33 (UTC)
  • 18-09-2021 10:42:33 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.8410, 12.9330 at 7 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 10 724 2878
Vallo di Nera PG 10 364 3242
Campello sul Clitunno PG 13 2442 5684
Norcia PG 14 4957 10641
Sant'Anatolia di Narco PG 14 564 11205
Poggiodomo PG 14 117 11322
Cascia PG 15 3217 14539
Trevi PG 16 8469 23008
Visso MC 16 1107 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)
53 Km SE of Perugia (166134 inhabitants)
66 Km W of Teramo (54892 inhabitants)
66 Km NW of L'Aquila (69753 inhabitants)
82 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 0.7 2021-09-18
08:42:33		 42.8408 12.9328 7 2021-09-18
08:55:23		 Sala Sismica INGV-Roma 95578001
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-09-18 08:42:33 ± 0.11
Latitude 42.8408 ± 0.0027
Longitude 12.9328 ± 0.0049
Depth (km) 7 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 95578001

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 322
Semi-minor axis of confidence ellipse (meter) 302
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 126
Circular confidence region, given by single value of horizontal uncertainty (meter) 320.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 199
Number of associated phases, regardless of their use for origin computation 22
Number of defining phases 6
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.05
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.22573
Number of stations at which the event was observed 19
Number of stations from which data was used for origin computation 3
Magnitude information

ML:0.7

Field Value
Value 0.7
Uncertainty 0.1
Num. used stations 6
Type of magnitude ML
Reference to an origin 95578001
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-09-18 08:55:23
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.EUCT.HNZ. 2021-09-18T08:44:19.31 3.0 undecidable manual Sn 0.52 0
IV.MRVN.HHZ. 2021-09-18T08:44:03.94 3.0 undecidable manual Sg 0.24 0
IV.GRI.EHZ. 2021-09-18T08:44:02.11 3.0 negative manual Pg 11.89 0
IV.CAFE.HHZ. 2021-09-18T08:43:47.69 3.0 undecidable manual Sn -3.39 0
IV.ORI.HHZ. 2021-09-18T08:43:46.15 3.0 undecidable manual Pg 9.21 0
IV.CADC.HNZ. 2021-09-18T08:43:35.98 3.0 undecidable manual Pg 6.26 0
MN.TRI.HHZ. 2021-09-18T08:43:31.44 3.0 positive manual Pg 6.94 0
OX.VARN.HHZ. 2021-09-18T08:43:27.41 3.0 undecidable manual Pn -0.93 0
GU.GORR.HHZ. 2021-09-18T08:43:26.27 3.0 negative manual Pn -1.73 0
IV.ZEN8.EHZ. 2021-09-18T08:43:24.32 3.0 undecidable manual Pn -4.15 0
IV.TST02.HHZ. 2021-09-18T08:43:17.44 3.0 undecidable manual S -6.26 0
IV.CELB.HHZ. 2021-09-18T08:43:10.40 3.0 negative manual Pn -1.55 0
IV.OSSC.HHZ. 2021-09-18T08:43:01.97 3.0 negative manual P -1.8 0
IV.PARC.HHZ. 2021-09-18T08:42:55.22 3.0 positive manual P -1.45 0
IV.POFI.HHZ. 2021-09-18T08:42:54.47 3.0 undecidable manual P -7.09 0
IV.OFFI.HHZ. 2021-09-18T08:42:45.51 3.0 undecidable manual P -3.47 0
IV.FDMO.HHZ. 2021-09-18T08:42:42.75 0.6 undecidable manual S 30 25.0527 105 0.05 49
IV.GAVE.EHZ. 2021-09-18T08:42:39.95 0.6 undecidable manual S 191 16.7721 112 -0.02 50
IV.NRCA.HHZ. 2021-09-18T08:42:39.30 0.6 undecidable manual S 93 14.7741 115 -0.03 50
IV.FDMO.HHZ. 2021-09-18T08:42:38.81 0.6 undecidable manual P 30 25.0527 105 -0.08 49
IV.GAVE.EHZ. 2021-09-18T08:42:37.34 0.3 positive manual P 191 16.7721 112 0.02 75
IV.NRCA.HHZ. 2021-09-18T08:42:36.97 0.1 positive manual P 93 14.7741 115 0.02 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.NRCA.HHE. ML:0.7 0.00006154999999999999 0.18 AML other m 2021-09-18T08:42:39.41
IV.NRCA.HHN. ML:0.6 0.00004615 0.66 AML other m 2021-09-18T08:42:39.56
IV.GAVE.EHN. ML:0.7 0.00004679999999999999 0.48 AML other m 2021-09-18T08:42:40.50
IV.GAVE.EHE. ML:0.8 0.0000528 0.94 AML other m 2021-09-18T08:42:40.14
IV.FDMO.HHN. ML:0.8 0.000041 0.12 AML other m 2021-09-18T08:42:42.92
IV.FDMO.HHE. ML:0.7 0.0000282 0.56 AML other m 2021-09-18T08:42:43.89
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