Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 0.9 on date 31-10-2021 and time 09:49:51 (Italy) in region 5 km W Gualdo Tadino (PG)

A magnitude ML 0.9 earthquake occured in region: 5 km W Gualdo Tadino (PG), on

  • 31-10-2021 08:49:51 (UTC)
  • 31-10-2021 09:49:51 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 43.2150, 12.7250 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
Gualdo Tadino PG 5 15208 15208
Fossato di Vico PG 10 2840 18048
Valfabbrica PG 12 3389 21437
Nocera Umbra PG 13 5839 27276
Sigillo PG 13 2404 29680
Costacciaro PG 16 1216 30896
Fiuminata MC 17 1402 32298
Valtopina PG 17 1398 33696
Assisi PG 18 28299 61995
Esanatoglia MC 19 2034 64029
Gubbio PG 20 32216 96245
Sefro MC 20 422 96667
Fabriano AN 20 31480 128147

Municipalities with at least 50000 inhabitants

An earthquake occurred to
29 Km N of Foligno (57155 inhabitants)
30 Km E of Perugia (166134 inhabitants)
73 Km N of Terni (111501 inhabitants)
74 Km E of Arezzo (99543 inhabitants)
74 Km SW of Fano (60888 inhabitants)
78 Km SW of Ancona (100861 inhabitants)
79 Km S of Pesaro (94582 inhabitants)
95 Km S of Rimini (147750 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 0.9 2021-10-31
08:49:51		 43.2147 12.7253 7 2021-10-31
09:49:29		 Sala Sismica INGV-Roma 97107641
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-10-31 08:49:51 ± 0.24
Latitude 43.2147 ± 0.0036
Longitude 12.7253 ± 0.0037
Depth (km) 7 ± 3 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 97107641

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 430
Semi-minor axis of confidence ellipse (meter) 86
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 166
Circular confidence region, given by single value of horizontal uncertainty (meter) 430.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 148
Number of associated phases, regardless of their use for origin computation 19
Number of defining phases 6
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.14
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.17897
Number of stations at which the event was observed 15
Number of stations from which data was used for origin computation 3
Magnitude information

ML:0.9

Field Value
Value 0.9
Uncertainty 0.3
Num. used stations 10
Type of magnitude ML
Reference to an origin 97107641
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-10-31 09:49:29
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.SCIAC.HHZ. 2021-10-31T08:51:17.06 3.0 positive manual Pg 13.96 0
IV.MTMR.EHZ. 2021-10-31T08:51:14.60 3.0 undecidable manual Sg 17.540001 0
IV.SELL.HHZ. 2021-10-31T08:51:11.78 3.0 positive manual Pg 29.49 0
IV.ECTS.HHZ. 2021-10-31T08:50:57.91 3.0 undecidable manual Pn 2.13 0
IV.EFIU.HHZ. 2021-10-31T08:50:56.38 3.0 negative manual Pn -0.65 0
IV.ZEN8.EHZ. 2021-10-31T08:50:46.04 3.0 undecidable manual Sn -5.23 0
IV.MML1.EHZ. 2021-10-31T08:50:29.56 3.0 undecidable manual Sg 6.91 0
IV.BOZZ.EHZ. 2021-10-31T08:50:14.74 3.0 positive manual Pg 2.59 0
IV.GIUL.HHZ. 2021-10-31T08:50:10.34 3.0 negative manual Pn -0.09 0
IV.ZEN8.EHZ. 2021-10-31T08:50:10.97 3.0 undecidable manual Pn -0.54 0
IV.FIU.EHZ. 2021-10-31T08:50:08.88 3.0 negative manual Pg 6.76 0
IV.MURB.HHZ. 2021-10-31T08:49:58.02 0.3 undecidable manual S 288 17.0718 112 0.05 75
IV.SNTG.HHZ. 2021-10-31T08:49:58.31 0.3 undecidable manual S 76 17.9709 111 0.05 75
IV.ASSB.HHZ. 2021-10-31T08:49:58.76 0.3 undecidable manual S 196 19.869 109 -0.1 74
IV.IMOL.HNZ. 2021-10-31T08:49:58.07 3.0 negative manual Pn -1.81 0
IV.BRSN.HNZ. 2021-10-31T08:49:57.13 3.0 negative manual P 0.26 0
IV.MURB.HHZ. 2021-10-31T08:49:55.18 0.3 undecidable manual P 288 17.0718 112 -0.09 75
IV.SNTG.HHZ. 2021-10-31T08:49:55.36 0.1 undecidable manual P 76 17.9709 111 -0.07 100
IV.ASSB.HHZ. 2021-10-31T08:49:55.92 0.1 undecidable manual P 196 19.869 109 0.14 98
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.MURB.HHE. ML:1.2 0.000135 0.18 AML other m 2021-10-31T08:49:58.51
IV.MURB.HHN. ML:0.8 0.0000618831 0.2368 AML other m 2021-10-31T08:49:58.34
IV.MURB.HNE. ML:1.2 0.000146126695 0.8192 AML other m 2021-10-31T08:50:00.77
IV.MURB.HNN. ML:1.2 0.00014661465 0.928 AML other m 2021-10-31T08:50:03.49
IV.SNTG.HHE. ML:0.2 0.000014209145499999999 0.2048 AML other m 2021-10-31T08:49:58.62
IV.SNTG.HHN. ML:0.6 0.000033139415 0.2368 AML other m 2021-10-31T08:49:58.74
IV.SNTG.HNE. ML:1.2 0.00013730774 1.1968 AML other m 2021-10-31T08:50:19.16
IV.SNTG.HNN. ML:1.0 0.00009047705 0.7488 AML other m 2021-10-31T08:50:02.20
IV.ASSB.HHE. ML:0.6 0.000034024165 0.3392 AML other m 2021-10-31T08:49:58.89
IV.ASSB.HHN. ML:0.3 0.000016305705 0.1024 AML other m 2021-10-31T08:49:59.04
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