Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.3 on date 21-08-2019 and time 18:34:02 (Italy) in region 8 km E Norcia (PG)

A magnitude ML 1.3 earthquake occured in region: 8 km E Norcia (PG), on

  • 21-08-2019 16:34:02 (UTC)
  • 21-08-2019 18:34:02 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.7720, 13.1830 at 11 km depth.

The earthquake was located by: Bollettino Sismico Italiano INGV.

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
Norcia PG 8 4957 4957
Arquata del Tronto AP 9 1178 6135
Accumoli RI 10 667 6802
Castelsantangelo sul Nera MC 14 281 7083
Montegallo AP 15 523 7606
Cascia PG 15 3217 10823
Preci PG 17 724 11547
Cittareale RI 17 482 12029
Amatrice RI 18 2657 14686
Montemonaco AP 19 604 15290
Acquasanta Terme AP 19 2916 18206
Visso MC 19 1107 19313
Ussita MC 20 444 19757

Municipalities with at least 50000 inhabitants

An earthquake occurred to
44 Km E of Foligno (57155 inhabitants)
45 Km W of Teramo (54892 inhabitants)
50 Km E of Terni (111501 inhabitants)
50 Km NW of L'Aquila (69753 inhabitants)
75 Km SE of Perugia (166134 inhabitants)
84 Km W of Montesilvano (53738 inhabitants)
91 Km W of Pescara (121014 inhabitants)
93 Km NW of Chieti (51815 inhabitants)
94 Km NE of Guidonia Montecelio (88673 inhabitants)
95 Km NE of Tivoli (56533 inhabitants)
97 Km E of Viterbo (67173 inhabitants)
98 Km S of Ancona (100861 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
Bulletin
Rev1000 		ML 1.3 2019-08-21
16:34:02		 42.7722 13.1827 11 2019-11-13
14:31:05		 Bollettino Sismico Italiano INGV 73139261
Reviewed
Rev100 		ML 1.4 2019-08-21
16:34:02		 42.7662 13.1808 10 2019-08-21
16:42:16		 Sala Sismica INGV-Roma 71682331
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2019-08-21 16:34:02 ± 0.04
Latitude 42.7722 ± 0.0027
Longitude 13.1827 ± 0.0037
Depth (km) 11 ± 0 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 73139261

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 295
Semi-minor axis of confidence ellipse (meter) 238
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 27
Circular confidence region, given by single value of horizontal uncertainty (meter) 300.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 109
Number of associated phases, regardless of their use for origin computation 32
Number of defining phases 20
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.12
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.34354
Number of stations at which the event was observed 21
Number of stations from which data was used for origin computation 10
Magnitudes information

ML:1.3

Field Value
Value 1.3
Uncertainty 0.4
Num. used stations 8
Type of magnitude ML
Reference to an origin 73139261
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2019-10-08 15:13:56

ML:1.4

Field Value
Value 1.4
Uncertainty 0.3
Num. used stations 10
Type of magnitude ML
Reference to an origin 71682331
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2019-08-21 16:42:16
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.IACL.HHZ. 2019-08-21T16:35:32.41 3.0 undecidable manual Sn -2.92 0
GU.GRAM.HHZ. 2019-08-21T16:35:12.79 3.0 undecidable manual Sn 0.67 0
GU.SATI.HHZ. 2019-08-21T16:35:08.68 3.0 undecidable manual Pn 2.73 0
IV.SPS2.HHZ. 2019-08-21T16:35:05.09 3.0 positive manual Pg 12.85 0
NI.PALA.HHZ. 2019-08-21T16:35:02.96 3.0 undecidable manual Pg 11.13 0
IV.MSRU.HHZ. 2019-08-21T16:35:00.93 3.0 negative manual Pn 2.15 0
GU.RNCA.HHZ. 2019-08-21T16:34:54.15 3.0 undecidable manual Pg 8.86 0
GU.GRAM.HHZ. 2019-08-21T16:34:48.58 3.0 undecidable manual Pg 11.12 0
IV.APEC.HHZ. 2019-08-21T16:34:32.00 3.0 undecidable manual S -0.43 0
TV.SF01.EHZ. 2019-08-21T16:34:22.02 3.0 undecidable manual S -2.67 0
IV.COR1.EHZ. 2019-08-21T16:34:19.41 3.0 positive manual Pg 3.24 0
IV.TERO.HHZ. 2019-08-21T16:34:14.63 0.6 undecidable manual S 116 38.1285 50 -0.09 47
IV.CAMP.HHE. 2019-08-21T16:34:12.95 0.6 undecidable manual S 145 32.0457 50 -0.15 47
IV.RM33.HNE. 2019-08-21T16:34:12.55 0.6 undecidable manual S 175 29.3484 50 0.19 47
IV.FDMO.HHZ. 2019-08-21T16:34:12.33 0.6 undecidable manual S 345 30.3474 50 -0.31 46
IV.LNSS.HNZ. 2019-08-21T16:34:10.40 0.6 undecidable manual S 212 22.0668 50 -0.03 49
IV.MTRA.EHZ. 2019-08-21T16:34:09.10 0.1 undecidable manual S 96 17.4714 122 -0.05 99
IV.TERO.HHZ. 2019-08-21T16:34:09.41 0.3 undecidable manual P 116 38.1285 50 0.06 71
IV.MMO1.EHZ. 2019-08-21T16:34:09.40 0.1 undecidable manual S 40 18.3705 120 0 99
IV.SMA1.EHN. 2019-08-21T16:34:09.90 0.6 undecidable manual S 142 20.0688 50 0.01 49
IV.FDMO.HHZ. 2019-08-21T16:34:08.28 0.3 undecidable manual P 345 30.3474 50 0.13 71
IV.CAMP.HHE. 2019-08-21T16:34:08.25 0.3 undecidable manual P 145 32.0457 50 -0.16 70
IV.MC2.EHZ. 2019-08-21T16:34:08.78 0.1 undecidable manual S 2 15.4734 125 0.22 95
IV.RM33.HNE. 2019-08-21T16:34:08.15 0.3 undecidable manual P 175 29.3484 50 0.16 71
IV.SMA1.EHN. 2019-08-21T16:34:06.58 0.1 undecidable manual P 142 20.0688 50 0.02 99
IV.MTRA.EHZ. 2019-08-21T16:34:06.14 0.1 undecidable manual P 96 17.4714 122 0.01 99
IV.NRCA.HHZ. 2019-08-21T16:34:06.60 0.1 undecidable manual S 321 8.7801 141 -0.24 96
IV.LNSS.HNZ. 2019-08-21T16:34:06.89 0.3 undecidable manual P 212 22.0668 50 0.02 74
IV.MMO1.EHZ. 2019-08-21T16:34:06.23 0.1 undecidable manual P 40 18.3705 120 -0.05 98
IV.MC2.EHZ. 2019-08-21T16:34:05.87 0.1 undecidable manual P 2 15.4734 125 0.08 98
IV.NRCA.HHZ. 2019-08-21T16:34:04.85 0.1 undecidable manual P 321 8.7801 141 0.05 100
IV.VIVA.HHZ. 2019-08-21T16:34:03.33 3.0 undecidable manual P -0.23 0
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.NRCA.HNE. ML:1.6 0.000468 0.1 AML other m 2019-08-21T16:34:06.70
IV.NRCA.HHE. ML:1.6 0.00047299999999999995 0.08 AML other m 2019-08-21T16:34:06.65
IV.NRCA.HHN. ML:1.6 0.000528 0.08 AML other m 2019-08-21T16:34:06.69
IV.NRCA.HNN. ML:1.5 0.000451 0.1 AML other m 2019-08-21T16:34:06.65
IV.MTRA.EHN. ML:0.7 0.000039 0.14 AML other m 2019-08-21T16:34:10.38
IV.MTRA.EHE. ML:0.7 0.000040749999999999994 0.82 AML other m 2019-08-21T16:34:10.07
IV.ASSB.HHN. ML:1.1 0.0000293 0.3 AML other m 2019-08-21T16:34:19.69
IV.ASSB.HHE. ML:1.1 0.000027700000000000002 0.52 AML other m 2019-08-21T16:34:21.34
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