Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 0.8 on date 30-08-2021 and time 11:13:55 (UTC) in region 2 km E Spoleto (PG)

A magnitude ML 0.8 earthquake occured in region: 2 km E Spoleto (PG), on

  • 30-08-2021 11:13:55 (UTC)
  • 30-08-2021 13:13:55 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.7420, 12.7620 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
Spoleto PG 2 38218 38218
Sant'Anatolia di Narco PG 6 564 38782
Scheggino PG 7 461 39243
Vallo di Nera PG 9 364 39607
Campello sul Clitunno PG 9 2442 42049
Castel Ritaldi PG 12 3278 45327
Ferentillo TR 14 1913 47240
Poggiodomo PG 15 117 47357
Trevi PG 15 8469 55826
Cerreto di Spoleto PG 15 1075 56901
Montefranco TR 16 1276 58177
Arrone TR 18 2763 60940
Giano dell'Umbria PG 18 3846 64786
Acquasparta TR 18 4778 69564
Monteleone di Spoleto PG 19 599 70163
Polino TR 19 233 70396
Montefalco PG 19 5679 76075
Massa Martana PG 20 3770 79845

Municipalities with at least 50000 inhabitants

An earthquake occurred to
22 Km NE of Terni (111501 inhabitants)
24 Km S of Foligno (57155 inhabitants)
51 Km SE of Perugia (166134 inhabitants)
65 Km NE of Viterbo (67173 inhabitants)
68 Km NW of L'Aquila (69753 inhabitants)
78 Km W of Teramo (54892 inhabitants)
82 Km N of Guidonia Montecelio (88673 inhabitants)
87 Km N of Tivoli (56533 inhabitants)
97 Km N of Roma (2864731 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 0.8 2021-08-30
11:13:55		 42.7415 12.7623 11 2021-12-29
11:12:29		 Bollettino Sismico Italiano INGV 95304021
Reviewed
Rev100 		ML 0.8 2021-08-30
11:13:55		 42.7528 12.7693 11 2021-08-30
11:23:16		 Sala Sismica INGV-Roma 94815881
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-08-30 11:13:55 ± 0.08
Latitude 42.7415 ± 0.0072
Longitude 12.7623 ± 0.0073
Depth (km) 11 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 95304021

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 909
Semi-minor axis of confidence ellipse (meter) 362
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 215
Circular confidence region, given by single value of horizontal uncertainty (meter) 910.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 170
Number of associated phases, regardless of their use for origin computation 14
Number of defining phases 14
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.18
Epicentral distance of station closest to the epicenter (degree) 0.10882
Epicentral distance of station farthest from the epicenter (degree) 0.35613
Number of stations at which the event was observed 7
Number of stations from which data was used for origin computation 7
Magnitudes information

ML:0.8

Field Value
Value 0.8
Uncertainty 0.2
Num. used stations 4
Type of magnitude ML
Reference to an origin 94815881
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-08-30 11:23:16

ML:0.8

Field Value
Value 0.8
Uncertainty 0.2
Num. used stations 4
Type of magnitude ML
Reference to an origin 95304021
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-12-16 20:40:09
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.MC2.EHE. 2021-08-30T11:14:08.89 0.6 undecidable manual S 61 39.5271 50 0.55 42
IV.NRCA.HHZ. 2021-08-30T11:14:06.20 0.6 undecidable manual S 70 30.4473 50 0.28 46
IV.LNSS.HHZ. 2021-08-30T11:14:05.08 0.6 undecidable manual S 124 27.3504 50 -0.03 49
IV.CESI.HHZ. 2021-08-30T11:14:05.75 0.6 undecidable manual S 22 31.4463 50 -0.44 44
IT.GNU.HGZ. 2021-08-30T11:14:02.31 0.6 undecidable manual S 294 17.0718 122 0.12 49
IV.MC2.EHE. 2021-08-30T11:14:02.92 1.0 undecidable manual P 61 39.5271 50 0.13 23
IV.MOMA.HHZ. 2021-08-30T11:14:02.26 0.3 undecidable manual S 294 17.0718 122 0.07 74
IV.CESI.HHZ. 2021-08-30T11:14:01.33 0.3 undecidable manual P 22 31.4463 50 -0.22 70
IV.NRCA.HHZ. 2021-08-30T11:14:01.31 0.6 undecidable manual P 70 30.4473 50 -0.09 48
IV.LNSS.HHZ. 2021-08-30T11:14:00.87 0.3 undecidable manual P 124 27.3504 50 -0.06 72
IV.GAVE.EHZ. 2021-08-30T11:14:00.66 0.6 undecidable manual S 117 12.0768 131 -0.12 49
IT.GNU.HGZ. 2021-08-30T11:13:59.38 0.6 undecidable manual P 294 17.0718 122 0.14 48
IV.MOMA.HHZ. 2021-08-30T11:13:59.20 0.1 undecidable manual P 294 17.0718 122 -0.05 99
IV.GAVE.EHZ. 2021-08-30T11:13:58.41 0.1 undecidable manual P 117 12.0768 131 -0.02 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.GAVE.EHE. ML:0.9 0.0000888 0.3 AML other m 2021-08-30T11:14:01.47
IV.GAVE.EHN. ML:0.9 0.00008955 0.18 AML other m 2021-08-30T11:14:02.27
IV.MOMA.HHN. ML:0.6 0.0000302 0.12 AML other m 2021-08-30T11:14:02.42
IV.MOMA.HHE. ML:0.7 0.00004015 0.16 AML other m 2021-08-30T11:14:02.76
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