Earthquake with magnitude of ML 0.4 on date 04-09-2021 and time 21:49:39 (Italy) in region 3 km SE Pietralunga (PG)

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

  • 04-09-2021 19:49:39 (UTC)
  • 04-09-2021 21:49:39 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 43.429, 12.47 at 5 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 3 2111 2111
Gubbio PG 12 32216 34327
Montone PG 14 1680 36007
Cantiano PU 14 2245 38252
Apecchio PU 15 1882 40134
Scheggia e Pascelupo PG 16 1393 41527
Umbertide PG 18 16681 58208
Piobbico PU 18 2029 60237
CittĂ  di Castello PG 19 39913 100150
Cagli PU 20 8731 108881

Municipalities with at least 50000 inhabitants

An earthquake occurred to
36 Km N of Perugia (166134 inhabitants)
48 Km E of Arezzo (99543 inhabitants)
56 Km NW of Foligno (57155 inhabitants)
64 Km SW of Fano (60888 inhabitants)
64 Km SW of Pesaro (94582 inhabitants)
71 Km S of Rimini (147750 inhabitants)
81 Km S of Cesena (96758 inhabitants)
87 Km W of Ancona (100861 inhabitants)
93 Km E of Siena (53903 inhabitants)
95 Km SE of Forlì (117913 inhabitants)
98 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 the effects of the earthquake on the territory in terms of the MCS (Mercalli-Cancani-Sieberg) intensity scale. The intensities are determined using the data provided in the questionnaire (http://www.haisentitoilterremoto.it/) that are analysed using robust statistical techniques since they are not verified individually. Specifically, the assignment of MCS intensities greater or equal the VI degree of the MCS scale require opportune in situ verification by professional experts. The purple start shows the epicenter. This map is prepared every so often that the population fill in new questionnaires. The number of questionnaires used to determine the map and the date and time of the last adjournment are shown in the upper right part of the panel.
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Reviewed
Rev100
ML 0.4 2021-09-04
19:49:39
43.4293 12.4695 5 2021-09-04
19:54:10
Sala Sismica INGV-Roma 95044711
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-09-04 19:49:39 ± 0.21
Latitude 43.4293 ± 0.0045
Longitude 12.4695 ± 0.0099
Depth (km) 5 ± 2 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 95044711

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 658
Semi-minor axis of confidence ellipse (meter) 459
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 100
Circular confidence region, given by single value of horizontal uncertainty (meter) 660
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 160
Number of associated phases, regardless of their use for origin computation 12
Number of defining phases 11
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.24
Epicentral distance of station closest to the epicenter (degree) 0
Epicentral distance of station farthest from the epicenter (degree) 0.34894
Number of stations at which the event was observed 7
Number of stations from which data was used for origin computation 6
Magnitude information

ML:0.4

Field Value
Value 0.4
Uncertainty 0
Num. used stations 2
Type of magnitude ML
Reference to an origin 95044711
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-09-04 19:54:10
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
TV.SF04.EHZ. 2021-09-04T19:49:56.65 3.0 positive manual P 0.37 0
IV.ATCC.EHZ. 2021-09-04T19:49:50.22 0.3 undecidable manual S 153 0.2734 100 -0.04 72
IV.ARVD.HHZ. 2021-09-04T19:49:48.23 0.6 undecidable manual P 79 0.3489 97 0.83 38
IV.NARO.HHZ. 2021-09-04T19:49:47.35 0.6 undecidable manual S 24 0.1988 103 -0.05 49
IV.MURB.HHZ. 2021-09-04T19:49:46.65 0.3 undecidable manual S 166 0.1709 105 0.26 70
IV.ATCC.EHZ. 2021-09-04T19:49:45.47 0.1 undecidable manual P 153 0.2734 100 -0.27 92
IV.NARO.HHZ. 2021-09-04T19:49:44.00 0.1 undecidable manual P 24 0.1988 103 -0.09 97
IV.MURB.HHZ. 2021-09-04T19:49:43.46 0.1 undecidable manual P 166 0.1709 105 -0.04 98
IV.ATFO.HHZ. 2021-09-04T19:49:43.60 0.3 undecidable manual S 130 0.0971 115 -0.1 74
IV.ATVO.HHZ. 2021-09-04T19:49:42.67 0.3 undecidable manual S 224 0.0657 125 0.02 76
IV.ATVO.HHZ. 2021-09-04T19:49:41.41 0.1 undecidable manual P 224 0.0657 125 0.06 100
IV.ATFO.HHZ. 2021-09-04T19:49:41.89 0.1 undecidable manual P 130 0.0971 115 -0.06 99
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.ATFO.HHN. ML:0.5 4.45E-5 0.48 AML other m 2021-09-04T19:49:44.25
IV.ATFO.HHE. ML:0.4 4.16E-5 0.32 AML other m 2021-09-04T19:49:44.48
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