INGVCENTRO​NAZIONALE​TERREMOTI
Sala Sismica

Earthquake with magnitude of ML 1.1 on date 09-08-2018 and time 16:03:14 (Italy) in region 4 km SW Accumoli (RI)

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

  • 09-08-2018 14:03:14 (UTC)
  • 09-08-2018 16:03:14 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.67, 13.21 at 13 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
Accumoli RI 4 667 667
Cittareale RI 7 482 1149
Amatrice RI 7 2657 3806
Arquata del Tronto AP 14 1178 4984
Montereale AQ 16 2581 7565
Norcia PG 17 4957 12522
Cascia PG 17 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 20 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)
79 Km W of Montesilvano (53738 inhabitants)
83 Km SE of Perugia (166134 inhabitants)
84 Km NE of Guidonia Montecelio (88673 inhabitants)
85 Km W of Pescara (121014 inhabitants)
85 Km NE of Tivoli (56533 inhabitants)
86 Km W of Chieti (51815 inhabitants)
95 Km E of Viterbo (67173 inhabitants)
Recent and historical Seismicity
Seismic hazard
Shakemap
Felt maps
The earthquake effects in MCS scale as obtained from the compiled questionnaire

The earthquake effects in MCS scale as obtained from the compiled 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
Rev 100 ML 1.1 2018-08-09
14:03:14
42.67 13.21 13 2018-08-09
14:06:54
Sala Sismica INGV-Roma 59555131
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2018-08-09 14:03:14 ± 0.09
Latitude 42.67 ± 0.00
Longitude 13.21 ± 0.00
Depth (km) 13 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 59555131

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 330
Semi-minor axis of confidence ellipse (meter) 278
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 28
Circular confidence region, given by single value of horizontal uncertainty (meter) 330
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 93
Number of associated phases, regardless of their use for origin computation 14
Number of defining phases 14
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.13
Epicentral distance of station closest to the epicenter (degree) 0.09713
Epicentral distance of station farthest from the epicenter (degree) 0.34084
Number of stations at which the event was observed 7
Number of stations from which data was used for origin computation 7
Magnitude information

ML:1.1

Field Value
Value 1.1
Uncertainty 0.3
Num. used stations 12
Type of magnitude ML
Reference to an origin 59555131
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2018-08-09 14:06:54
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.GIGS.HHZ. 2018-08-09T14:03:26.35 0.6 undecidable manual S 129 0.3408 94 -0.22 46
IV.TERO.HHZ. 2018-08-09T14:03:25.06 0.6 undecidable manual S 99 0.2905 96 -0.03 48
IV.RM33.EHZ. 2018-08-09T14:03:21.16 0.6 undecidable manual S 180 0.1592 108 -0.12 49
IV.MTRA.EHZ. 2018-08-09T14:03:21.15 0.6 undecidable manual S 57 0.1601 108 -0.16 48
IV.GIGS.HHZ. 2018-08-09T14:03:21.13 1.0 undecidable manual P 129 0.3408 94 -0.14 23
IV.NRCA.HHZ. 2018-08-09T14:03:21.73 0.3 undecidable manual S 336 0.1808 104 -0.15 72
IV.TERO.HHZ. 2018-08-09T14:03:20.41 0.3 positive manual P 99 0.2905 96 0 73
IV.LNSS.HHZ. 2018-08-09T14:03:20.67 0.6 undecidable manual S 243 0.1439 112 -0.17 48
IV.SMA1.EHZ. 2018-08-09T14:03:19.67 0.6 undecidable manual S 113 0.0971 128 0.04 51
IV.NRCA.HHZ. 2018-08-09T14:03:18.57 0.1 positive manual P 336 0.1808 104 0.01 99
IV.LNSS.HHZ. 2018-08-09T14:03:18.01 0.1 undecidable manual P 243 0.1439 112 0.06 100
IV.RM33.EHZ. 2018-08-09T14:03:18.31 0.6 undecidable manual P 180 0.1592 108 0.1 49
IV.MTRA.EHZ. 2018-08-09T14:03:18.41 0.3 undecidable manual P 57 0.1601 108 0.19 73
IV.SMA1.EHZ. 2018-08-09T14:03:17.62 0.6 undecidable manual P 113 0.0971 128 0.36 47
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.SMA1.EHE. ML:1.7 0.0004875 0.32 AML other m 2018-08-09T14:03:20.20
IV.SMA1.EHN. ML:1.6 0.0004245 0.36 AML other m 2018-08-09T14:03:20.27
IV.LNSS.HHE. ML:1.1 9.465E-5 0.84 AML other m 2018-08-09T14:03:21.47
IV.MTRA.EHN. ML:1.3 0.0001575 0.14 AML other m 2018-08-09T14:03:21.38
IV.RM33.EHE. ML:0.9 5.415E-5 0.12 AML other m 2018-08-09T14:03:21.50
IV.LNSS.HHN. ML:1.2 0.00013715 0.1 AML other m 2018-08-09T14:03:21.56
IV.MTRA.EHE. ML:1.3 0.00014 1.1 AML other m 2018-08-09T14:03:21.88
IV.NRCA.HHE. ML:1.3 0.0001365 0.18 AML other m 2018-08-09T14:03:21.80
IV.RM33.EHN. ML:0.7 3.69E-5 0.58 AML other m 2018-08-09T14:03:22.24
IV.NRCA.HHN. ML:1.1 9.34E-5 0.64 AML other m 2018-08-09T14:03:22.48
IV.TERO.HHN. ML:0.8 3.16E-5 0.58 AML other m 2018-08-09T14:03:25.46
IV.TERO.HHE. ML:0.8 2.655E-5 0.82 AML other m 2018-08-09T14:03:26.83
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