Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 0.9 on date 04-04-2021 and time 07:01:35 (Italy) in region 6 km SE Pietralunga (PG)

A magnitude ML 0.9 earthquake occured in region: 6 km SE Pietralunga (PG), on

  • 04-04-2021 05:01:35 (UTC)
  • 04-04-2021 07:01:35 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 43.3960, 12.4670 at 6 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 6 2111 2111
Gubbio PG 10 32216 34327
Montone PG 12 1680 36007
Umbertide PG 15 16681 52688
Cantiano PU 16 2245 54933
Scheggia e Pascelupo PG 16 1393 56326
Apecchio PU 19 1882 58208
Città di Castello PG 20 39913 98121

Municipalities with at least 50000 inhabitants

An earthquake occurred to
33 Km N of Perugia (166134 inhabitants)
48 Km E of Arezzo (99543 inhabitants)
53 Km NW of Foligno (57155 inhabitants)
67 Km SW of Fano (60888 inhabitants)
68 Km SW of Pesaro (94582 inhabitants)
75 Km S of Rimini (147750 inhabitants)
84 Km S of Cesena (96758 inhabitants)
88 Km W of Ancona (100861 inhabitants)
92 Km E of Siena (53903 inhabitants)
94 Km N of Terni (111501 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 0.9 2021-04-04
05:01:35		 43.3958 12.4673 6 2021-04-04
05:10:58		 Sala Sismica INGV-Roma 88758741
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-04-04 05:01:35 ± 0.11
Latitude 43.3958 ± 0.0027
Longitude 12.4673 ± 0.0037
Depth (km) 6 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 88758741

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 290
Semi-minor axis of confidence ellipse (meter) 181
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 149
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) 97
Number of associated phases, regardless of their use for origin computation 28
Number of defining phases 24
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) 0.02698
Epicentral distance of station farthest from the epicenter (degree) 0.35883
Number of stations at which the event was observed 14
Number of stations from which data was used for origin computation 13
Magnitude information

ML:0.9

Field Value
Value 0.9
Uncertainty 0.2
Num. used stations 16
Type of magnitude ML
Reference to an origin 88758741
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-04-04 05:10:58
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.ARVD.HHZ. 2021-04-04T05:01:49.10 0.6 undecidable manual S 73 39.8268 99 -0.18 46
IV.FRON.EHZ. 2021-04-04T05:01:44.08 0.6 undecidable manual S 57 24.8529 104 -0.08 48
IV.ARVD.HHZ. 2021-04-04T05:01:43.34 1.0 positive manual P 73 39.8268 99 -0.03 24
IV.BADI.EHZ. 2021-04-04T05:01:43.68 3.0 undecidable manual S 305 21.9669 105 0.48 0
IV.MURB.HHZ. 2021-04-04T05:01:42.14 3.0 undecidable manual S 15.4734 1.08 0
IV.APEC.HHZ. 2021-04-04T05:01:42.26 0.6 undecidable manual S 348 18.4704 108 0.23 47
IV.PIEI.HHZ. 2021-04-04T05:01:41.68 0.6 undecidable manual S 19 16.4724 110 0.3 47
IV.FRON.EHZ. 2021-04-04T05:01:40.10 0.3 negative manual P 57 24.8529 104 -0.32 69
IV.ATBU.HNZ. 2021-04-04T05:01:40.03 0.6 undecidable manual S 36 10.9779 119 0.37 46
IV.ATPC.HNZ. 2021-04-04T05:01:39.23 0.6 undecidable manual S 355 9.4794 123 0.04 50
IV.APEC.HHZ. 2021-04-04T05:01:39.45 1.0 positive manual P 348 18.4704 108 0.26 23
IV.ATFO.HHN. 2021-04-04T05:01:39.10 0.6 undecidable manual S 111 8.9799 124 0.03 50
IV.MURB.HHZ. 2021-04-04T05:01:39.16 3.0 undecidable manual P 15.4734 0.54 0
IV.BADI.EHZ. 2021-04-04T05:01:39.96 0.6 negative manual P 305 21.9669 105 0.1 48
IV.ATLO.HNE. 2021-04-04T05:01:39.98 3.0 undecidable manual S 208 10.1787 121 0.57 0
IV.PIEI.HHZ. 2021-04-04T05:01:38.77 0.6 positive manual P 19 16.4724 110 -0.04 49
IV.TB02.DHZ.01 2021-04-04T05:01:38.36 0.6 undecidable manual S 239 5.4945 138 0.23 48
IV.ATPI.EHZ. 2021-04-04T05:01:38.66 0.3 undecidable manual S 319 7.9809 127 -0.13 74
IV.ATLO.HNE. 2021-04-04T05:01:37.90 0.1 undecidable manual P 208 10.1787 121 0.23 96
IV.TB03.DHZ. 2021-04-04T05:01:37.77 0.6 undecidable manual S 278 4.5954 143 -0.18 49
IV.ATBU.HNZ. 2021-04-04T05:01:37.86 0.1 undecidable manual P 36 10.9779 119 0.05 99
IV.ATPC.HNZ. 2021-04-04T05:01:37.40 0.1 undecidable manual P 355 9.4794 123 -0.15 97
IV.ATFO.HHN. 2021-04-04T05:01:37.54 0.1 undecidable manual P 111 8.9799 124 0.07 99
IV.ATPI.EHZ. 2021-04-04T05:01:37.18 0.6 negative manual P 319 7.9809 127 -0.14 49
IV.TB01.DHN. 2021-04-04T05:01:37.60 0.6 undecidable manual S 238 2.997 154 -0.05 50
IV.TB01.DHN. 2021-04-04T05:01:36.54 0.1 undecidable manual P 238 2.997 154 -0.12 99
IV.TB03.DHZ. 2021-04-04T05:01:36.68 0.1 undecidable manual P 278 4.5954 143 -0.15 98
IV.TB02.DHZ.01 2021-04-04T05:01:36.99 0.1 undecidable manual P 239 5.4945 138 0.06 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.ATPI.EHN. ML:0.9 0.000135051075 0.16 AML other m 2021-04-04T05:01:38.79
IV.ATPI.EHE. ML:0.8 0.000124610955 0.3008 AML other m 2021-04-04T05:01:39.94
IV.PIEI.HHN. ML:1.0 0.0000932 0.36 AML other m 2021-04-04T05:01:42.25
IV.PIEI.HHE. ML:1.0 0.00009829169 0.24 AML other m 2021-04-04T05:01:42.37
IV.ATPI.HNE. ML:0.9 0.0001399328 0.2816 AML other m 2021-04-04T05:01:40.09
IV.ATPI.HNN. ML:0.9 0.00015012390500000001 0.3808 AML other m 2021-04-04T05:01:39.92
IV.APEC.HNE. ML:1.9 0.0006645612399999999 1.2608 AML other m 2021-04-04T05:01:45.76
IV.APEC.HNN. ML:2.0 0.0008025704499999999 0.2912 AML other m 2021-04-04T05:01:45.64
IV.APEC.HHE. ML:1.0 0.00007832442 0.16 AML other m 2021-04-04T05:01:42.55
IV.APEC.HHN. ML:0.9 0.000072432865 0.2784 AML other m 2021-04-04T05:01:43.53
IV.BADI.EHE. ML:0.9 0.0000562736915 0.3008 AML other m 2021-04-04T05:01:43.89
IV.BADI.EHN. ML:0.9 0.00006002069 0.1824 AML other m 2021-04-04T05:01:43.81
IV.FRON.EHE. ML:0.6 0.000026044535 0.2208 AML other m 2021-04-04T05:01:44.73
IV.FRON.EHN. ML:0.9 0.00005266234 0.1184 AML other m 2021-04-04T05:01:44.48
IV.ARVD.HHE. ML:0.8 0.000022879179999999998 1.1008 AML other m 2021-04-04T05:01:49.55
IV.ARVD.HHN. ML:1.0 0.00003875562 1.76 AML other m 2021-04-04T05:01:48.81
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