Earthquake with magnitude of ML 1.8 on date 21-09-2021 and time 18:38:54 (Italy) in region 4 km N Spoleto (PG)

A magnitude ML 1.8 earthquake occured in region: 4 km N Spoleto (PG), on

  • 21-09-2021 16:38:54 (UTC)
  • 21-09-2021 18:38:54 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.772, 12.754 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.

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 4 38218 38218
Campello sul Clitunno PG 6 2442 40660
Sant'Anatolia di Narco PG 8 564 41224
Castel Ritaldi PG 9 3278 44502
Vallo di Nera PG 9 364 44866
Scheggino PG 9 461 45327
Trevi PG 12 8469 53796
Cerreto di Spoleto PG 14 1075 54871
Montefalco PG 16 5679 60550
Giano dell'Umbria PG 16 3846 64396
Poggiodomo PG 16 117 64513
Ferentillo TR 17 1913 66426
Massa Martana PG 19 3770 70196
Acquasparta TR 19 4778 74974
Sellano PG 19 1079 76053
Montefranco TR 19 1276 77329

Municipalities with at least 50000 inhabitants

An earthquake occurred to
21 Km S of Foligno (57155 inhabitants)
25 Km NE of Terni (111501 inhabitants)
48 Km SE of Perugia (166134 inhabitants)
66 Km NE of Viterbo (67173 inhabitants)
71 Km NW of L'Aquila (69753 inhabitants)
79 Km W of Teramo (54892 inhabitants)
86 Km N of Guidonia Montecelio (88673 inhabitants)
90 Km N of Tivoli (56533 inhabitants)
100 Km N of Roma (2864731 inhabitants)
Recent and historical seismicity
Seismic hazard
Shakemap
Felt maps
Preliminary map of the earthquake effects from the web questionnaire

Preliminary map of the earthquake effects from the web questionnaire

This map shows the distribution of the effects of the earthquake on the territory in terms of the MCS (Mercalli-Cancani-Sieberg) intensity scale. The intensities are determined using the data provided in the questionnaire (http://www.haisentitoilterremoto.it/) that are analysed using robust statistical techniques since they are not verified individually. Specifically, the assignment of MCS intensities greater or equal the VI degree of the MCS scale require opportune in situ verification by professional experts. The purple start shows the epicenter. This map is prepared every so often that the population fill in new questionnaires. The number of questionnaires used to determine the map and the date and time of the last adjournment are shown in the upper right part of the panel.
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Reviewed
Rev100
ML 1.8 2021-09-21
16:38:54
42.7723 12.7542 10 2021-09-21
17:09:48
Sala Sismica INGV-Roma 95710781
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-09-21 16:38:54 ± 0.07
Latitude 42.7723 ± 0.0045
Longitude 12.7542 ± 0.0074
Depth (km) 10 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 95710781

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 566
Semi-minor axis of confidence ellipse (meter) 408
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 239
Circular confidence region, given by single value of horizontal uncertainty (meter) 570
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 102
Number of associated phases, regardless of their use for origin computation 57
Number of defining phases 28
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.26
Epicentral distance of station closest to the epicenter (degree) 0
Epicentral distance of station farthest from the epicenter (degree) 0.55938
Number of stations at which the event was observed 41
Number of stations from which data was used for origin computation 14
Magnitude information

ML:1.8

Field Value
Value 1.8
Uncertainty 0.2
Num. used stations 32
Type of magnitude ML
Reference to an origin 95710781
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-09-21 17:09:48
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.PTRJ.HNZ. 2021-09-21T16:39:34.22 3.0 undecidable manual Sn -9.99 0
AC.VLO.HHZ. 2021-09-21T16:39:30.14 3.0 undecidable manual Pn -4.74 0
CR.ZAG.BHZ. 2021-09-21T16:39:25.58 3.0 undecidable manual Sn 3.05 0
IV.ILOS.HHZ. 2021-09-21T16:39:25.07 3.0 positive manual Pn -1.16 0
IV.TDS.HHZ. 2021-09-21T16:39:21.33 3.0 positive manual Pn 1.88 0
IX.PGN3.HHZ.02 2021-09-21T16:39:19.91 3.0 positive manual Pg 13.89 0
IV.MF5.EHZ. 2021-09-21T16:39:14.83 0.3 undecidable manual S 67 0.5594 50 1.24 46
IV.MRLC.HHZ. 2021-09-21T16:39:14.12 3.0 undecidable manual Pg 12.08 0
IV.SMA1.EHZ. 2021-09-21T16:39:10.81 0.6 undecidable manual S 108 0.4497 50 0.48 43
IV.CSP1.EHZ. 2021-09-21T16:39:10.72 0.1 undecidable manual S 46 0.4587 50 0.11 93
IV.MMO1.EHZ. 2021-09-21T16:39:10.17 0.1 undecidable manual S 73 0.4389 50 0.17 92
IV.RM33.EHZ. 2021-09-21T16:39:09.58 0.1 undecidable manual S 128 0.429 50 -0.13 93
IX.MNT3.EHZ.02 2021-09-21T16:39:08.72 3.0 undecidable manual Pg 10.6 0
IV.MC2.EHZ. 2021-09-21T16:39:07.62 0.1 undecidable manual S 66 0.348 50 0.31 91
IV.FDMO.HHZ. 2021-09-21T16:39:07.48 0.1 undecidable manual S 43 0.3597 50 -0.18 94
IV.MF5.EHZ. 2021-09-21T16:39:06.00 0.3 undecidable manual P 67 0.5594 50 0.55 62
IV.PTRJ.HNZ. 2021-09-21T16:39:05.62 3.0 undecidable manual Pg 16.27 0
IV.CESI.HHZ. 2021-09-21T16:39:04.36 0.1 undecidable manual S 25 0.2572 50 -0.27 94
IV.LNSS.HHZ. 2021-09-21T16:39:04.71 0.1 undecidable manual S 129 0.2698 50 -0.29 93
IV.NRCA.HHZ. 2021-09-21T16:39:04.59 0.3 undecidable manual S 77 0.2707 50 -0.45 67
IV.RM33.EHZ. 2021-09-21T16:39:03.12 0.1 undecidable manual P 128 0.429 50 -0.09 94
IV.CSP1.EHZ. 2021-09-21T16:39:03.71 0.1 undecidable manual P 46 0.4587 50 -0.02 95
IV.CESX.HHZ. 2021-09-21T16:39:03.01 0.1 undecidable manual S 217 0.205 114 0.06 99
IV.MMO1.EHZ. 2021-09-21T16:39:03.25 0.1 undecidable manual P 73 0.4389 50 -0.13 93
IV.SMA1.EHZ. 2021-09-21T16:39:03.66 0.1 undecidable manual P 108 0.4497 50 0.09 94
IV.SENA.HHZ. 2021-09-21T16:39:03.50 3.0 undecidable manual Pg 14.63 0
IV.ARRO.EHZ. 2021-09-21T16:39:02.59 0.1 undecidable manual S 177 0.1934 115 0.04 100
IV.MC2.EHZ. 2021-09-21T16:39:01.84 0.1 undecidable manual P 66 0.348 50 0.02 97
IV.FDMO.HHZ. 2021-09-21T16:39:01.84 0.1 undecidable manual P 43 0.3597 50 -0.18 94
IV.LNSS.HHZ. 2021-09-21T16:39:00.46 0.1 undecidable manual P 129 0.2698 50 -0.03 98
IV.NRCA.HHZ. 2021-09-21T16:39:00.28 0.1 undecidable manual P 77 0.2707 50 -0.23 94
IV.GAVE.EHZ. 2021-09-21T16:39:00.32 0.1 undecidable manual S 128 0.1304 125 -0.12 99
IV.MOMA.HHZ. 2021-09-21T16:39:00.64 0.1 undecidable manual S 283 0.1385 123 -0.07 100
IV.CESI.HHZ. 2021-09-21T16:39:00.14 0.1 undecidable manual P 25 0.2572 50 -0.14 96
IV.ARRO.EHZ. 2021-09-21T16:38:59.12 0.1 undecidable manual P 177 0.1934 115 0.05 99
IV.CESX.HHZ. 2021-09-21T16:38:59.50 0.1 undecidable manual P 217 0.205 114 0.19 96
IV.MOMA.HHZ. 2021-09-21T16:38:58.13 0.1 undecidable manual P 283 0.1385 123 0.12 99
IV.GAVE.EHZ. 2021-09-21T16:38:57.78 0.1 undecidable manual P 128 0.1304 125 -0.08 100
IV.SACR.HHZ. 2021-09-21T16:38:49.45 3.0 negative manual Pn -0.64 0
IV.PTCC.HHZ. 2021-09-21T16:38:48.69 3.0 undecidable manual Sg 4.62 0
MN.TRI.HHZ. 2021-09-21T16:38:43.85 3.0 undecidable manual Sn -0.66 0
OT.OT17.EHZ. 2021-09-21T16:38:42.78 3.0 undecidable manual Pn -8.79 0
GU.IMI.HHZ. 2021-09-21T16:38:41.66 3.0 undecidable manual Sn 0.25 0
OX.SABO.HHZ. 2021-09-21T16:38:40.69 3.0 undecidable manual Sn -3.45 0
IV.PE3.EHZ. 2021-09-21T16:38:38.40 3.0 undecidable manual Sg 1.12 0
IV.SARZ.HHZ. 2021-09-21T16:38:16.97 3.0 undecidable manual Sn 2.22 0
IV.BRSN.HNZ. 2021-09-21T16:38:09.28 3.0 undecidable manual Sn -9.99 0
IV.OSSC.HHZ. 2021-09-21T16:38:08.00 3.0 undecidable manual Pg 0.94 0
IV.MBAL.EHZ. 2021-09-21T16:38:07.01 3.0 undecidable manual Sg 6.98 0
IV.CSNT.HHZ. 2021-09-21T16:38:05.19 3.0 negative manual Pg -2.67 0
IV.FIR.HHZ. 2021-09-21T16:38:03.64 3.0 undecidable manual Pg -0.21 0
IV.ZEN8.EHZ. 2021-09-21T16:37:53.09 3.0 undecidable manual Pg 4.13 0
GU.GRAM.HHZ. 2021-09-21T16:37:51.86 3.0 positive manual Pg -1.53 0
IV.CAPR.HNZ. 2021-09-21T16:37:51.27 3.0 negative manual P 0.44 0
IV.MBAL.EHZ. 2021-09-21T16:37:50.78 3.0 positive manual P 0.19 0
IV.FIU.EHZ. 2021-09-21T16:37:48.23 3.0 negative manual P -7.21 0
IV.MNTV.EHZ. 2021-09-21T16:37:45.38 3.0 undecidable manual P 0.74 0
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.MOMA.HNN. ML:2 0.000849 0.22 AML other m 2021-09-21T16:39:01.12
IV.MOMA.HHN. ML:2 0.00085722375 0.2176 AML other m 2021-09-21T16:39:01.13
IV.GAVE.EHE. ML:2.2 0.001743489 0.1536 AML other m 2021-09-21T16:39:01.38
IV.GAVE.HNE. ML:2.2 0.00169 0.18 AML other m 2021-09-21T16:39:01.37
IV.GAVE.EHN. ML:2 0.00096020065 0.1152 AML other m 2021-09-21T16:39:01.75
IV.MOMA.HNE. ML:2.2 0.001485 1.82 AML other m 2021-09-21T16:39:02.97
IV.MOMA.HHE. ML:2.2 0.001575 1.82 AML other m 2021-09-21T16:39:02.97
IV.GAVE.HNN. ML:1.5 0.0003117401 0.3072 AML other m 2021-09-21T16:39:02.21
IV.ARRO.EHN. ML:1.5 0.000203 0.16 AML other m 2021-09-21T16:39:04.54
IV.CESI.HHN. ML:2 0.0004725 0.26 AML other m 2021-09-21T16:39:04.75
IV.CESI.HHE. ML:1.7 0.000257 0.48 AML other m 2021-09-21T16:39:04.75
IV.ARRO.EHE. ML:1.6 0.0002535 1.82 AML other m 2021-09-21T16:39:04.01
IV.NRCA.HHE. ML:1.8 0.000303 0.16 AML other m 2021-09-21T16:39:05.18
IV.LNSS.HHE. ML:1.9 0.000408 1.2 AML other m 2021-09-21T16:39:05.32
IV.NRCA.HHN. ML:1.7 0.0002418184 0.0896 AML other m 2021-09-21T16:39:05.51
IV.LNSS.HHN. ML:2 0.000435 0.24 AML other m 2021-09-21T16:39:05.48
IV.CESX.HHE. ML:1.6 0.0002845 0.42 AML other m 2021-09-21T16:39:06.44
IV.CESX.HHN. ML:1.6 0.000236 0.28 AML other m 2021-09-21T16:39:08.14
IV.FDMO.HHE. ML:1.7 0.000162 1.64 AML other m 2021-09-21T16:39:08.16
IV.FDMO.HHN. ML:1.6 0.000148 0.12 AML other m 2021-09-21T16:39:08.58
IV.CSP1.EHE. ML:2.2 0.0004002515 0.2432 AML other m 2021-09-21T16:39:11.61
IV.RM33.EHE. ML:1.6 0.00010655 0.42 AML other m 2021-09-21T16:39:11.72
IV.CSP1.EHN. ML:2 0.0002607202 0.192 AML other m 2021-09-21T16:39:12.71
IV.SMA1.EHN. ML:1.8 0.0001505 1.58 AML other m 2021-09-21T16:39:13.81
IV.RM33.EHN. ML:1.6 0.0001028155 0.32 AML other m 2021-09-21T16:39:13.52
IV.SMA1.EHE. ML:1.7 0.000127 1.76 AML other m 2021-09-21T16:39:14.04
IV.CESI.HNN. ML:1.9 0.000427916 0.1664 AML other m 2021-09-21T16:39:04.75
IV.NRCA.HNE. ML:1.7 0.0002625342 0.1024 AML other m 2021-09-21T16:39:07.08
IV.NRCA.HNN. ML:1.6 0.0002153349 0.0768 AML other m 2021-09-21T16:39:05.51
IV.LNSS.HNE. ML:1.8 0.0003268249 0.128 AML other m 2021-09-21T16:39:07.30
IV.LNSS.HNN. ML:1.8 0.0003360316 0.3584 AML other m 2021-09-21T16:39:09.23
IV.RM33.HNE. ML:1.6 0.00011470855 0.3968 AML other m 2021-09-21T16:39:13.35
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