Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 0.1 on date 28-09-2021 and time 01:55:58 (Italy) in region 7 km SE Pietralunga (PG)

A magnitude ML 0.1 earthquake occured in region: 7 km SE Pietralunga (PG), on

  • 27-09-2021 23:55:58 (UTC)
  • 28-09-2021 01:55:58 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 43.4040, 12.5020 at 9 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
Pietralunga PG 7 2111 2111
Gubbio PG 8 32216 34327
Cantiano PU 13 2245 36572
Scheggia e Pascelupo PG 14 1393 37965
Montone PG 15 1680 39645
Costacciaro PG 18 1216 40861
Umbertide PG 18 16681 57542
Apecchio PU 19 1882 59424
Cagli PU 20 8731 68155

Municipalities with at least 50000 inhabitants

An earthquake occurred to
34 Km N of Perugia (166134 inhabitants)
50 Km E of Arezzo (99543 inhabitants)
52 Km NW of Foligno (57155 inhabitants)
64 Km SW of Fano (60888 inhabitants)
65 Km SW of Pesaro (94582 inhabitants)
73 Km S of Rimini (147750 inhabitants)
84 Km S of Cesena (96758 inhabitants)
86 Km W of Ancona (100861 inhabitants)
94 Km N of Terni (111501 inhabitants)
95 Km E of Siena (53903 inhabitants)
98 Km SE of Forlì (117913 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 0.1 2021-09-27
23:55:58		 43.4038 12.5018 9 2021-09-28
00:06:04		 Sala Sismica INGV-Roma 95967431
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-09-27 23:55:58 ± 0.12
Latitude 43.4038 ± 0.0018
Longitude 12.5018 ± 0.0050
Depth (km) 9 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 95967431

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 293
Semi-minor axis of confidence ellipse (meter) 270
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 101
Circular confidence region, given by single value of horizontal uncertainty (meter) 290.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 100
Number of associated phases, regardless of their use for origin computation 24
Number of defining phases 24
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) 0.05306
Epicentral distance of station farthest from the epicenter (degree) 0.24102
Number of stations at which the event was observed 12
Number of stations from which data was used for origin computation 12
Magnitude information

ML:0.1

Field Value
Value 0.1
Uncertainty 0.2
Num. used stations 12
Type of magnitude ML
Reference to an origin 95967431
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-09-28 00:06:04
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.ATCC.EHZ. 2021-09-27T23:56:07.93 0.3 undecidable manual S 155 26.751 108 0.15 70
IV.NARO.HHZ. 2021-09-27T23:56:06.49 0.3 undecidable manual S 15 23.8539 110 -0.33 68
IV.APEC.HHZ. 2021-09-27T23:56:05.31 0.3 undecidable manual S 339 18.3705 116 0.23 70
IV.FRON.EHZ. 2021-09-27T23:56:05.95 0.3 undecidable manual S 55 22.0668 112 -0.29 69
IV.MURB.HHZ. 2021-09-27T23:56:04.46 0.1 undecidable manual S 173 15.7731 119 0.19 95
IV.ATLO.HNE. 2021-09-27T23:56:03.18 0.1 undecidable manual S 218 12.4764 125 -0.13 96
IV.ATCC.EHZ. 2021-09-27T23:56:03.59 0.1 undecidable manual P 155 26.751 108 -0.06 95
IV.NARO.HHZ. 2021-09-27T23:56:02.84 0.1 undecidable manual P 15 23.8539 110 -0.26 92
IV.ATBU.HNZ. 2021-09-27T23:56:02.67 0.3 undecidable manual S 25 8.7801 135 0.34 70
IV.APEC.HHZ. 2021-09-27T23:56:02.18 0.1 undecidable manual P 339 18.3705 116 0.08 96
IV.ATPI.EHZ. 2021-09-27T23:56:02.50 0.3 undecidable manual S 303 9.5793 133 -0.02 74
IV.TB02.DHZ.01 2021-09-27T23:56:02.03 0.3 undecidable manual S 244 8.2806 137 -0.19 72
IV.FRON.EHZ. 2021-09-27T23:56:02.59 0.1 undecidable manual P 55 22.0668 112 -0.17 94
IV.ATPC.HHZ. 2021-09-27T23:56:02.64 0.3 undecidable manual S 337 9.2796 134 0.19 72
IV.TB01.DHN.01 2021-09-27T23:56:01.43 0.3 undecidable manual S 245 5.8941 146 -0.26 71
IV.MURB.HHZ. 2021-09-27T23:56:01.65 0.1 undecidable manual P 173 15.7731 119 0.02 98
IV.TB03.DHZ.01 2021-09-27T23:56:01.75 0.3 undecidable manual S 268 7.3815 140 -0.25 71
IV.ATLO.HNE. 2021-09-27T23:56:01.12 0.1 undecidable manual P 218 12.4764 125 0.05 98
IV.ATPI.EHZ. 2021-09-27T23:56:00.71 0.1 undecidable manual P 303 9.5793 133 0.09 98
IV.TB02.DHZ.01 2021-09-27T23:56:00.52 0.1 undecidable manual P 244 8.2806 137 0.08 98
IV.ATPC.HHZ. 2021-09-27T23:56:00.74 0.1 undecidable manual P 337 9.2796 134 0.17 96
IV.TB01.DHN.01 2021-09-27T23:56:00.14 0.1 undecidable manual P 245 5.8941 146 0 100
IV.TB03.DHZ.01 2021-09-27T23:56:00.32 0.1 undecidable manual P 268 7.3815 140 0 100
IV.ATBU.HNZ. 2021-09-27T23:56:00.74 0.1 undecidable manual P 25 8.7801 135 0.23 95
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.ATPI.EHE. ML:-0.2 0.000008743585999999999 0.2176 AML other m 2021-09-27T23:56:03.02
IV.ATPI.EHN. ML:-0.2 0.000010606231 0.1792 AML other m 2021-09-27T23:56:03.78
IV.MURB.HHE. ML:0.2 0.00001677337 0.1792 AML other m 2021-09-27T23:56:05.50
IV.MURB.HHN. ML:0.5 0.000032031434999999995 0.1792 AML other m 2021-09-27T23:56:05.11
IV.APEC.HHE. ML:0.1 0.000008114293099999999 0.128 AML other m 2021-09-27T23:56:05.90
IV.APEC.HHN. ML:0.1 0.000007857434 0.128 AML other m 2021-09-27T23:56:05.67
IV.FRON.EHE. ML:0.2 0.000012438894999999998 0.0768 AML other m 2021-09-27T23:56:06.22
IV.FRON.EHN. ML:0.3 0.000015578085 0.0896 AML other m 2021-09-27T23:56:06.39
IV.NARO.HHE. ML:-0.1 0.000004316244000000001 0.064 AML other m 2021-09-27T23:56:07.08
IV.NARO.HHN. ML:-0.1 0.000004795395500000001 0.064 AML other m 2021-09-27T23:56:07.28
IV.ATCC.EHE. ML:0.2 0.000011396024 0.1024 AML other m 2021-09-27T23:56:08.15
IV.ATCC.EHN. ML:0.0 0.00000729951 0.2048 AML other m 2021-09-27T23:56:08.07
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