Earthquake with magnitude of ML 1.0 on date 27-09-2021 and time 03:44:11 (UTC) in region 5 km NE Spoleto (PG)

A magnitude ML 1.0 earthquake occured in region: 5 km NE Spoleto (PG), on

  • 27-09-2021 03:44:11 (UTC)
  • 27-09-2021 05:44:11 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.775, 12.759 at 11 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 5 38218 38218
Campello sul Clitunno PG 5 2442 40660
Sant'Anatolia di Narco PG 8 564 41224
Vallo di Nera PG 9 364 41588
Castel Ritaldi PG 9 3278 44866
Scheggino PG 9 461 45327
Trevi PG 12 8469 53796
Cerreto di Spoleto PG 14 1075 54871
Montefalco PG 16 5679 60550
Poggiodomo PG 16 117 60667
Giano dell'Umbria PG 16 3846 64513
Ferentillo TR 17 1913 66426
Sellano PG 19 1079 67505
Massa Martana PG 19 3770 71275
Acquasparta TR 20 4778 76053
Montefranco TR 20 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)
67 Km NE of Viterbo (67173 inhabitants)
71 Km NW of L'Aquila (69753 inhabitants)
78 Km W of Teramo (54892 inhabitants)
86 Km N of Guidonia Montecelio (88673 inhabitants)
90 Km N of Tivoli (56533 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 1.0 2021-09-27
03:44:11
42.7752 12.7588 11 2021-09-27
04:04:59
Sala Sismica INGV-Roma 95925661
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-09-27 03:44:11 ± 0.08
Latitude 42.7752 ± 0.0054
Longitude 12.7588 ± 0.0074
Depth (km) 11 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 95925661

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 736
Semi-minor axis of confidence ellipse (meter) 438
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 220
Circular confidence region, given by single value of horizontal uncertainty (meter) 740
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 65
Number of associated phases, regardless of their use for origin computation 17
Number of defining phases 16
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.22
Epicentral distance of station closest to the epicenter (degree) 0
Epicentral distance of station farthest from the epicenter (degree) 0.27699
Number of stations at which the event was observed 9
Number of stations from which data was used for origin computation 8
Magnitude information

ML:1

Field Value
Value 1
Uncertainty 0.3
Num. used stations 20
Type of magnitude ML
Reference to an origin 95925661
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-09-27 04:04:59
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.NRCA.HHZ. 2021-09-27T03:44:22.24 0.6 undecidable manual S 77 0.2671 50 -0.09 64
IV.LNSS.HNZ. 2021-09-27T03:44:22.22 0.6 undecidable manual S 130 0.2689 50 -0.17 62
IV.ASSB.HHZ. 2021-09-27T03:44:22.78 0.6 undecidable manual S 345 0.277 50 0.16 64
IV.CESI.HHZ. 2021-09-27T03:44:21.90 0.6 undecidable manual S 25 0.2536 50 -0.01 65
IV.ARRO.EHZ. 2021-09-27T03:44:20.72 0.6 undecidable manual S 179 0.1961 50 0.5 60
IV.MMO1.EHZ. 2021-09-27T03:44:20.66 3.0 negative manual P -0.27 0
IV.CESX.HHZ. 2021-09-27T03:44:20.05 0.6 undecidable manual S 217 0.2095 50 -0.56 55
IV.ASSB.HHZ. 2021-09-27T03:44:18.16 0.6 negative manual P 345 0.277 50 0.08 64
IV.MOMA.HHZ. 2021-09-27T03:44:18.42 0.3 undecidable manual S 282 0.1412 124 -0.05 100
IV.LNSS.HNZ. 2021-09-27T03:44:17.80 0.3 undecidable manual P 130 0.2689 50 -0.14 94
IV.CESX.HHZ. 2021-09-27T03:44:17.32 0.6 undecidable manual P 217 0.2095 50 0.4 61
IV.ARRO.EHZ. 2021-09-27T03:44:17.21 0.3 undecidable manual P 179 0.1961 50 0.52 89
IV.GAVE.EHZ. 2021-09-27T03:44:17.99 0.3 undecidable manual S 130 0.1295 127 -0.1 100
IV.NRCA.HHZ. 2021-09-27T03:44:17.79 0.6 negative manual P 77 0.2671 50 -0.12 63
IV.CESI.HHZ. 2021-09-27T03:44:17.80 0.3 undecidable manual P 25 0.2536 50 0.13 95
IV.MOMA.HHZ. 2021-09-27T03:44:15.50 0.3 negative manual P 282 0.1412 124 -0.18 97
IV.GAVE.EHZ. 2021-09-27T03:44:15.39 0.3 positive manual P 130 0.1295 127 -0.08 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.MOMA.HHE. ML:1.3 0.000195 0.24 AML other m 2021-09-27T03:44:18.63
IV.GAVE.EHE. ML:1 9.3119705E-5 0.1824 AML other m 2021-09-27T03:44:19.62
IV.MOMA.HHN. ML:0.8 5.674154E-5 0.1984 AML other m 2021-09-27T03:44:18.93
IV.GAVE.EHN. ML:1 8.415E-5 0.48 AML other m 2021-09-27T03:44:20.31
IV.NRCA.HHE. ML:0.9 3.9664035E-5 0.0992 AML other m 2021-09-27T03:44:24.65
IV.NRCA.HHN. ML:0.9 3.713561E-5 0.1024 AML other m 2021-09-27T03:44:23.55
IV.GAVE.HNE. ML:1 9.9616789E-5 0.0896 AML other m 2021-09-27T03:44:18.49
IV.GAVE.HNN. ML:1.1 0.00013141335 0.9792 AML other m 2021-09-27T03:44:23.04
IV.MOMA.HNE. ML:1.3 0.000168382515 0.2208 AML other m 2021-09-27T03:44:18.63
IV.MOMA.HNN. ML:0.9 7.4401295E-5 0.2016 AML other m 2021-09-27T03:44:18.94
IV.ARRO.EHE. ML:0.5 2.18038135E-5 0.2016 AML other m 2021-09-27T03:44:20.78
IV.ARRO.EHN. ML:0.5 1.750439E-5 0.2208 AML other m 2021-09-27T03:44:30.54
IV.NRCA.HNE. ML:1.3 0.000104317065 0.5408 AML other m 2021-09-27T03:44:21.78
IV.NRCA.HNN. ML:1.5 0.0001592627 1.0208 AML other m 2021-09-27T03:44:31.09
IV.CESI.HHE. ML:0.6 1.98397175E-5 0.08 AML other m 2021-09-27T03:44:22.02
IV.CESI.HHN. ML:1 5.1856115E-5 0.1792 AML other m 2021-09-27T03:44:21.91
IV.CESI.HNE. ML:1.4 0.00012688515 0.8992 AML other m 2021-09-27T03:44:19.27
IV.CESI.HNN. ML:1.5 0.00016924415 0.912 AML other m 2021-09-27T03:44:29.59
IV.ASSB.HHE. ML:0.7 2.6003935E-5 0.4384 AML other m 2021-09-27T03:44:22.84
IV.ASSB.HHN. ML:0.6 2.053773E-5 0.0608 AML other m 2021-09-27T03:44:23.86
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