Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 0.4 on date 07-09-2021 and time 02:28:31 (UTC) in region 3 km SE Pietralunga (PG)

A magnitude ML 0.4 earthquake occured in region: 3 km SE Pietralunga (PG), on

  • 07-09-2021 02:28:31 (UTC)
  • 07-09-2021 04:28:31 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 43.4200, 12.4640 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
Pietralunga PG 3 2111 2111
Gubbio PG 12 32216 34327
Montone PG 13 1680 36007
Cantiano PU 15 2245 38252
Apecchio PU 16 1882 40134
Scheggia e Pascelupo PG 17 1393 41527
Umbertide PG 17 16681 58208
Città di Castello PG 19 39913 98121
Piobbico PU 19 2029 100150

Municipalities with at least 50000 inhabitants

An earthquake occurred to
35 Km N of Perugia (166134 inhabitants)
47 Km E of Arezzo (99543 inhabitants)
55 Km NW of Foligno (57155 inhabitants)
65 Km SW of Fano (60888 inhabitants)
66 Km SW of Pesaro (94582 inhabitants)
72 Km S of Rimini (147750 inhabitants)
82 Km S of Cesena (96758 inhabitants)
88 Km W of Ancona (100861 inhabitants)
92 Km E of Siena (53903 inhabitants)
96 Km SE of Forlì (117913 inhabitants)
97 Km N of Terni (111501 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 0.4 2021-09-07
02:28:31		 43.4198 12.4643 7 2021-09-07
02:39:54		 Sala Sismica INGV-Roma 95131181
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-09-07 02:28:31 ± 0.15
Latitude 43.4198 ± 0.0027
Longitude 12.4643 ± 0.0062
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 95131181

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 357
Semi-minor axis of confidence ellipse (meter) 352
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 120
Circular confidence region, given by single value of horizontal uncertainty (meter) 360.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 101
Number of associated phases, regardless of their use for origin computation 34
Number of defining phases 22
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.2
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.21314
Number of stations at which the event was observed 22
Number of stations from which data was used for origin computation 11
Magnitude information

ML:0.4

Field Value
Value 0.4
Uncertainty 0.2
Num. used stations 4
Type of magnitude ML
Reference to an origin 95131181
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-09-07 02:39:54
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
AC.SRN.HHZ. 2021-09-07T02:30:18.09 3.0 undecidable manual Pg 20.68 0
IV.QLNO.HHZ. 2021-09-07T02:30:06.36 3.0 undecidable manual Sn 11.21 0
NI.VINO.HHZ. 2021-09-07T02:30:01.56 3.0 undecidable manual Sg 2.72 0
IV.HPAC.HHZ. 2021-09-07T02:29:51.84 3.0 positive manual Pn -5.76 0
IV.ICAI.EHZ. 2021-09-07T02:29:27.12 3.0 undecidable manual Sn -5.25 0
IV.MAGA.HHZ. 2021-09-07T02:29:22.31 3.0 negative manual Pg 8.92 0
IV.VULT.HHZ. 2021-09-07T02:29:15.59 3.0 undecidable manual Pg 4.77 0
IV.ICAI.EHZ. 2021-09-07T02:29:01.27 3.0 positive manual Pn -0.81 0
IV.FIU.EHZ. 2021-09-07T02:28:59.36 3.0 positive manual Pg 3.57 0
IV.RMP.HHZ. 2021-09-07T02:28:53.42 3.0 undecidable manual S -5.89 0
IV.RIBO.EHZ.01 2021-09-07T02:28:48.38 3.0 undecidable manual P 5.05 0
IV.NARO.HHZ. 2021-09-07T02:28:39.80 0.1 undecidable manual S 24 23.1546 107 -0.34 91
IV.FRON.EHZ. 2021-09-07T02:28:39.99 0.1 undecidable manual S 63 23.6541 106 -0.32 91
IV.MURB.HHZ. 2021-09-07T02:28:38.93 0.1 undecidable manual S 164 18.0708 111 0.46 89
IV.APEC.HHZ. 2021-09-07T02:28:37.98 0.1 undecidable manual S 347 15.7731 114 0.25 94
IV.NARO.HHZ. 2021-09-07T02:28:36.26 1.0 negative manual P 24 23.1546 107 -0.33 23
IV.ATBU.HNN. 2021-09-07T02:28:36.01 0.1 undecidable manual S 47 9.1797 127 0.27 94
IV.FRON.EHZ. 2021-09-07T02:28:36.37 1.0 negative manual P 63 23.6541 106 -0.32 23
IV.APEC.HHZ. 2021-09-07T02:28:35.56 1.0 undecidable manual P 347 15.7731 114 0.35 23
IV.TB02.DHN.01 2021-09-07T02:28:35.19 0.1 undecidable manual S 219 7.0929 134 0.01 100
IV.MURB.HHZ. 2021-09-07T02:28:35.56 0.1 undecidable manual P 164 18.0708 111 -0.07 97
IV.ATPC.HHN. 2021-09-07T02:28:35.27 0.1 undecidable manual S 355 6.7932 136 0.16 97
IV.ATVO.HHZ. 2021-09-07T02:28:34.91 0.1 undecidable manual S 228 6.2937 138 -0.08 99
IV.TB03.DHZ.01 2021-09-07T02:28:34.58 0.1 undecidable manual S 245 4.7952 145 -0.1 99
IV.ATPI.EHZ. 2021-09-07T02:28:34.91 0.1 undecidable manual S 304 6.0939 139 -0.03 100
IV.TB01.DHZ.01 2021-09-07T02:28:34.45 0.1 undecidable manual S 209 4.8951 145 -0.23 96
IV.ATBU.HNN. 2021-09-07T02:28:34.22 0.1 undecidable manual P 47 9.1797 127 0.17 96
IV.ATPC.HHN. 2021-09-07T02:28:33.78 0.1 undecidable manual P 355 6.7932 136 0.09 98
IV.TB02.DHN.01 2021-09-07T02:28:33.70 0.1 undecidable manual P 219 7.0929 134 -0.03 99
IV.ATVO.HHZ. 2021-09-07T02:28:33.62 0.3 positive manual P 228 6.2937 138 0 75
IV.TB03.DHZ.01 2021-09-07T02:28:33.40 0.1 undecidable manual P 245 4.7952 145 -0.04 100
IV.ATPI.EHZ. 2021-09-07T02:28:33.66 0.6 undecidable manual P 304 6.0939 139 0.06 50
IV.TB01.DHZ.01 2021-09-07T02:28:33.35 0.1 undecidable manual P 209 4.8951 145 -0.1 99
IV.MOMA.HHZ. 2021-09-07T02:28:28.77 3.0 undecidable manual S 0 0
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.MURB.HHE. ML:0.5 0.00003211376844 0.1408 AML other m 2021-09-07T02:28:39.14
IV.MURB.HHN. ML:0.6 0.00003512648 0.2208 AML other m 2021-09-07T02:28:39.31
IV.ATPI.EHN. ML:0.0 0.00001879608 0.0992 AML other m 2021-09-07T02:28:35.06
IV.APEC.HHE. ML:0.3 0.0000189117075 0.1792 AML other m 2021-09-07T02:28:38.49
IV.APEC.HHN. ML:0.2 0.0000135189275 0.24 AML other m 2021-09-07T02:28:38.33
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