Earthquake with magnitude of ML 0.5 on date 21-09-2021 and time 05:16:55 (Italy) in region 4 km SE Pietralunga (PG)

A magnitude ML 0.5 earthquake occured in region: 4 km SE Pietralunga (PG), on

  • 21-09-2021 03:16:55 (UTC)
  • 21-09-2021 05:16:55 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 43.417, 12.467 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.

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 4 2111 2111
Gubbio PG 11 32216 34327
Montone PG 13 1680 36007
Cantiano PU 15 2245 38252
Scheggia e Pascelupo PG 16 1393 39645
Apecchio PU 16 1882 41527
Umbertide PG 17 16681 58208
CittĂ  di Castello PG 19 39913 98121
Piobbico PU 20 2029 100150

Municipalities with at least 50000 inhabitants

An earthquake occurred to
35 Km N of Perugia (166134 inhabitants)
48 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)
96 Km N of Terni (111501 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 earthquake resentment in the area, expressed in terms of intensity on the MCS scale (Mercalli-Cancani-Sieberg). Intensities are determined using data from questionnaires collected on the website http://www.hsit.it. The intensities shown are determined considering all the reports received from each municipality, and are all the more reliable the greater the number of questionnaires. The collected data are subjected to an automatic statistical filter, but are not checked individually. In particular, intensities greater than or equal to the VI degree of the MCS or EMS scale require on-site verification by specialized personnel. The black star is the epicenter of the earthquake that occurred. This map is updated every time citizens fill out new questionnaires. The number of questionnaires processed to obtain this map, the date and time of the last update are shown at the top right.
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Reviewed
Rev100
ML 0.5 2021-09-21
03:16:55
43.4168 12.4673 7 2021-09-21
03:25:00
Sala Sismica INGV-Roma 95683321
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-09-21 03:16:55 ± 0.13
Latitude 43.4168 ± 0.0027
Longitude 12.4673 ± 0.0050
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 95683321

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 354
Semi-minor axis of confidence ellipse (meter) 257
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 105
Circular confidence region, given by single value of horizontal uncertainty (meter) 350
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 79
Number of associated phases, regardless of their use for origin computation 33
Number of defining phases 22
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.19
Epicentral distance of station closest to the epicenter (degree) 0
Epicentral distance of station farthest from the epicenter (degree) 0.21044
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:0.5

Field Value
Value 0.5
Uncertainty 0.2
Num. used stations 6
Type of magnitude ML
Reference to an origin 95683321
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-09-21 03:25:00
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.IOCA.HHZ. 2021-09-21T03:18:22.76 3.0 undecidable manual Sg 3.97 0
IV.IVPL.HHZ. 2021-09-21T03:18:17.16 3.0 positive manual Pg 2.67 0
IV.PTRJ.HHZ. 2021-09-21T03:18:09.46 3.0 undecidable manual Sg -1.29 0
IV.MMN.HHZ. 2021-09-21T03:18:04.91 3.0 undecidable manual Pg 4.1 0
IV.MILZ.HHZ. 2021-09-21T03:18:03.80 3.0 positive manual Pn -9.99 0
MN.TRI.HHZ. 2021-09-21T03:17:57.54 3.0 undecidable manual Sg 5.75 0
IV.LAV9.HHZ. 2021-09-21T03:17:45.03 3.0 undecidable manual Sg -6.37 0
IV.PII.HHZ. 2021-09-21T03:17:34.40 3.0 undecidable manual Sg 3.85 0
IV.ZEN8.EHZ. 2021-09-21T03:17:28.52 3.0 positive manual Pg 4.09 0
IV.TST02.HHZ. 2021-09-21T03:17:25.89 3.0 positive manual Pg -2.28 0
IV.FIR.HHZ. 2021-09-21T03:17:04.78 3.0 undecidable manual Pg -1.97 0
IV.NARO.HHZ. 2021-09-21T03:17:03.38 0.3 undecidable manual S 23 0.2104 108 -0.44 66
IV.MURB.HHZ. 2021-09-21T03:17:02.40 0.3 undecidable manual S 165 0.1592 113 0.44 67
IV.APEC.HHZ. 2021-09-21T03:17:01.84 0.3 undecidable manual S 346 0.1457 115 0.35 69
IV.MURB.HHZ. 2021-09-21T03:16:59.16 0.1 undecidable manual P 165 0.1592 113 0.01 98
IV.ATBU.EHE. 2021-09-21T03:16:59.75 0.3 undecidable manual S 45 0.0827 129 0.33 70
IV.ATFO.HHZ. 2021-09-21T03:16:59.44 0.3 undecidable manual S 124 0.0908 126 -0.21 71
IV.NARO.HHZ. 2021-09-21T03:16:59.86 0.1 undecidable manual P 23 0.2104 108 -0.36 90
IV.ATPC.HNE. 2021-09-21T03:16:59.01 0.3 undecidable manual S 353 0.0648 136 0.12 73
IV.TB03.DH1.01 2021-09-21T03:16:58.24 0.3 undecidable manual S 250 0.0441 147 -0.16 73
IV.ATVO.HHZ. 2021-09-21T03:16:58.57 0.3 undecidable manual S 232 0.0558 140 -0.1 73
IV.APEC.HHZ. 2021-09-21T03:16:58.92 0.1 undecidable manual P 346 0.1457 115 0.05 97
IV.TB02.DHE.01 2021-09-21T03:16:58.84 0.3 undecidable manual S 222 0.063 137 0 75
IV.ATPI.EHZ. 2021-09-21T03:16:58.66 0.3 undecidable manual S 306 0.0585 139 -0.06 74
IV.TB01.DHE.01 2021-09-21T03:16:58.24 0.1 undecidable manual S 213 0.0423 148 -0.11 98
IV.ATBU.EHE. 2021-09-21T03:16:57.83 0.1 undecidable manual P 45 0.0827 129 0.15 97
IV.TB01.DHE.01 2021-09-21T03:16:57.03 0.1 undecidable manual P 213 0.0423 148 -0.04 100
IV.ATFO.HHZ. 2021-09-21T03:16:57.73 0.1 undecidable manual P 124 0.0908 126 -0.09 98
IV.ATPC.HNE. 2021-09-21T03:16:57.48 0.1 undecidable manual P 353 0.0648 136 0.11 98
IV.TB03.DH1.01 2021-09-21T03:16:57.07 0.1 undecidable manual P 250 0.0441 147 -0.02 100
IV.ATVO.HHZ. 2021-09-21T03:16:57.25 0.1 undecidable manual P 232 0.0558 140 0 100
IV.TB02.DHE.01 2021-09-21T03:16:57.41 0.1 undecidable manual P 222 0.063 137 0.06 99
IV.ATPI.EHZ. 2021-09-21T03:16:57.33 0.1 undecidable manual P 306 0.0585 139 0.05 99
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.ATVO.HHE. ML:0 3.5073115E-5 1.6 AML other m 2021-09-21T03:16:56.48
IV.ATVO.HHN. ML:0 2.896855E-5 0.12 AML other m 2021-09-21T03:16:58.70
IV.ATPI.EHE. ML:0 1.99658685E-5 0.08 AML other m 2021-09-21T03:16:58.78
IV.ATPI.EHN. ML:0 1.79722185E-5 0.0784 AML other m 2021-09-21T03:16:58.75
IV.ATFO.HHE. ML:0.4 3.2658405E-5 0.2784 AML other m 2021-09-21T03:17:00.38
IV.ATFO.HHN. ML:0.3 2.7779885E-5 0.1984 AML other m 2021-09-21T03:17:00.02
IV.APEC.HHE. ML:0.4 2.450562E-5 0.76 AML other m 2021-09-21T03:17:12.70
IV.APEC.HHN. ML:0.6 3.408291E-5 1.2992 AML other m 2021-09-21T03:17:12.08
IV.MURB.HHE. ML:0.7 4.2676835E-5 1.3808 AML other m 2021-09-21T03:17:14.48
IV.MURB.HHN. ML:0.6 3.456938E-5 1.08 AML other m 2021-09-21T03:17:00.00
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