Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.1 on date 20-08-2019 and time 17:34:40 (Italy) in region 4 km SW Accumoli (RI)

A magnitude ML 1.1 earthquake occured in region: 4 km SW Accumoli (RI), on

  • 20-08-2019 15:34:40 (UTC)
  • 20-08-2019 17:34:40 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.67, 13.22 at 14 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
Accumoli RI 4 667 667
Cittareale RI 7 482 1149
Amatrice RI 7 2657 3806
Arquata del Tronto AP 13 1178 4984
Montereale AQ 16 2581 7565
Norcia PG 17 4957 12522
Cascia PG 18 3217 15739
Campotosto AQ 18 542 16281
Capitignano AQ 18 665 16946
Borbona RI 19 617 17563
Posta RI 19 694 18257
Acquasanta Terme AP 19 2916 21173

Municipalities with at least 50000 inhabitants

An earthquake occurred to
38 Km NW of L'Aquila (69753 inhabitants)
40 Km W of Teramo (54892 inhabitants)
48 Km E of Terni (111501 inhabitants)
53 Km SE of Foligno (57155 inhabitants)
78 Km W of Montesilvano (53738 inhabitants)
83 Km SE of Perugia (166134 inhabitants)
85 Km NE of Guidonia Montecelio (88673 inhabitants)
85 Km W of Pescara (121014 inhabitants)
86 Km W of Chieti (51815 inhabitants)
86 Km NE of Tivoli (56533 inhabitants)
95 Km E of Viterbo (67173 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
Rev 1000 ML 1.1 2019-08-20
15:34:40		 42.67 13.22 14 2019-11-13
14:31:04		 Bollettino Sismico Italiano INGV 72993921
Rev 100 ML 1.1 2019-08-20
15:34:40		 42.67 13.22 13 2019-08-20
15:50:36		 Sala Sismica INGV-Roma 71656241
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2019-08-20 15:34:40 ± 0.11
Latitude 42.67 ± 0.00
Longitude 13.22 ± 0.01
Depth (km) 14 ± 2 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 72993921

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 466
Semi-minor axis of confidence ellipse (meter) 391
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 286
Circular confidence region, given by single value of horizontal uncertainty (meter) 470
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 62
Number of associated phases, regardless of their use for origin computation 21
Number of defining phases 19
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.2
Epicentral distance of station closest to the epicenter (degree) 0
Epicentral distance of station farthest from the epicenter (degree) 0.28868
Number of stations at which the event was observed 12
Number of stations from which data was used for origin computation 10
Magnitudes information

ML:1.1

Field Value
Value 1.1
Uncertainty 0.2
Num. used stations 10
Type of magnitude ML
Reference to an origin 72993921
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2019-10-02 14:10:21

ML:1.1

Field Value
Value 1.1
Uncertainty 0.2
Num. used stations 12
Type of magnitude ML
Reference to an origin 71656241
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2019-08-20 15:50:36
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.ARVD.HHZ. 2019-08-20T15:35:09.82 3.0 undecidable manual S 0.1 0
TV.SF01.EHZ. 2019-08-20T15:35:01.22 3.0 undecidable manual P -0.62 0
IV.TERO.HHZ. 2019-08-20T15:34:51.18 0.3 undecidable manual S 99 0.2887 97 -0.29 70
IV.MMO1.EHZ. 2019-08-20T15:34:50.20 0.3 undecidable manual S 19 0.2437 100 0.04 74
IV.MC2.EHZ. 2019-08-20T15:34:50.63 0.3 undecidable manual S 355 0.2428 100 0.5 68
IV.CAMP.HHZ. 2019-08-20T15:34:48.44 0.6 undecidable manual S 133 0.1943 105 -0.3 48
IV.NRCA.HHZ. 2019-08-20T15:34:48.03 0.3 undecidable manual S 335 0.1808 107 -0.31 69
IV.RM33.EHZ. 2019-08-20T15:34:47.76 0.3 undecidable manual S 181 0.1601 111 -0.02 75
IV.LNSS.HHZ. 2019-08-20T15:34:47.47 0.3 undecidable manual S 243 0.1457 115 0.09 75
IV.MTRA.EHZ. 2019-08-20T15:34:47.44 0.3 undecidable manual S 56 0.1583 112 -0.27 71
IV.MMO1.EHZ. 2019-08-20T15:34:46.13 0.3 undecidable manual P 19 0.2437 100 0.08 73
IV.MC2.EHZ. 2019-08-20T15:34:46.19 0.3 undecidable manual P 355 0.2428 100 0.16 72
IV.SMA1.EHZ. 2019-08-20T15:34:46.16 0.3 undecidable manual S 114 0.0953 132 0.03 76
IV.TERO.HHZ. 2019-08-20T15:34:46.85 0.1 undecidable manual P 99 0.2887 97 0.05 97
IV.GAVE.HNZ. 2019-08-20T15:34:45.59 0.1 undecidable manual P 276 0.2383 100 -0.37 91
IV.CAMP.HHZ. 2019-08-20T15:34:45.22 0.1 undecidable manual P 133 0.1943 105 -0.01 99
IV.LNSS.HHZ. 2019-08-20T15:34:44.58 0.1 undecidable manual P 243 0.1457 115 0.13 99
IV.MTRA.EHZ. 2019-08-20T15:34:44.67 0.1 undecidable manual P 56 0.1583 112 0.04 100
IV.RM33.EHZ. 2019-08-20T15:34:44.79 0.1 undecidable manual P 181 0.1601 111 0.12 98
IV.NRCA.HHZ. 2019-08-20T15:34:44.99 0.1 undecidable manual P 335 0.1808 107 -0.01 99
IV.SMA1.EHZ. 2019-08-20T15:34:43.94 0.1 undecidable manual P 114 0.0953 132 0.22 97
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.SMA1.EHN. ML:1.2 0.00015 0.3 AML other m 2019-08-20T15:34:46.57
IV.SMA1.EHE. ML:1.4 0.000226 0.28 AML other m 2019-08-20T15:34:46.61
IV.MTRA.EHN. ML:1.2 0.0001145 0.14 AML other m 2019-08-20T15:34:47.54
IV.MTRA.EHE. ML:1.2 0.000111 0.46 AML other m 2019-08-20T15:34:47.92
IV.RM33.EHN. ML:1 6.385E-5 1.86 AML other m 2019-08-20T15:34:47.06
IV.NRCA.HHN. ML:1.3 0.000134 0.72 AML other m 2019-08-20T15:34:48.51
IV.LNSS.HHN. ML:1.1 9.2E-5 1.08 AML other m 2019-08-20T15:34:48.20
IV.NRCA.HHE. ML:1.6 0.00029 0.14 AML other m 2019-08-20T15:34:48.33
IV.LNSS.HHE. ML:1.1 9.825E-5 0.7 AML other m 2019-08-20T15:34:48.71
IV.RM33.EHE. ML:1 6.815E-5 0.32 AML other m 2019-08-20T15:34:48.38
IV.TERO.HHN. ML:1 3.785E-5 0.08 AML other m 2019-08-20T15:34:51.29
IV.TERO.HHE. ML:0.8 2.305E-5 0.94 AML other m 2019-08-20T15:34:52.10
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
Download
Type Description Link
QuakeML - small Event, Origin, FocalMechanism Download
QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download