INGVCENTRO​NAZIONALE​TERREMOTI
Sala Sismica

Earthquake with magnitude of ML 1.0 on date 21-03-2018 and time 19:45:20 (Italy) in region 6 km E Amatrice (RI)

A magnitude ML 1.0 earthquake occured in region: 6 km E Amatrice (RI), on

  • 21-03-2018 18:45:20 (UTC)
  • 21-03-2018 19:45:20 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.62, 13.36 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.

Municipalities within 20 km from the epicenter

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
Amatrice RI 6 2657 2657
Campotosto AQ 7 542 3199
Accumoli RI 12 667 3866
Capitignano AQ 12 665 4531
Cortino TE 12 656 5187
Crognaleto TE 13 1297 6484
Montereale AQ 14 2581 9065
Rocca Santa Maria TE 16 537 9602
Cittareale RI 16 482 10084
Fano Adriano TE 17 296 10380
Acquasanta Terme AP 17 2916 13296
Valle Castellana TE 17 977 14273
Arquata del Tronto AP 18 1178 15451
Pietracamela TE 19 271 15722
Barete AQ 20 737 16459

Municipalities with at least 50000 inhabitants

An earthquake occurred to
29 Km W of Teramo (54892 inhabitants)
30 Km N of L'Aquila (69753 inhabitants)
59 Km E of Terni (111501 inhabitants)
65 Km SE of Foligno (57155 inhabitants)
66 Km W of Montesilvano (53738 inhabitants)
72 Km W of Pescara (121014 inhabitants)
73 Km W of Chieti (51815 inhabitants)
87 Km NE of Tivoli (56533 inhabitants)
87 Km NE of Guidonia Montecelio (88673 inhabitants)
96 Km SE of Perugia (166134 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 1.0 2018-03-21
18:45:20
42.62 13.36 6 2018-03-21
18:58:15
Sala Sismica INGV-Roma 54745791
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2018-03-21 18:45:20 ± 0.2
Latitude 42.62 ± 0.00
Longitude 13.36 ± 0.01
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 54745791

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 499
Semi-minor axis of confidence ellipse (meter) 446
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 35
Circular confidence region, given by single value of horizontal uncertainty (meter) 500
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 124
Number of associated phases, regardless of their use for origin computation 19
Number of defining phases 12
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) 0.23203
Number of stations at which the event was observed 13
Number of stations from which data was used for origin computation 6
Magnitude information

ML:1

Field Value
Value 1
Uncertainty 0.1
Num. used stations 2
Type of magnitude ML
Reference to an origin 54745791
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2018-03-21 18:58:15
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.CTI.HHZ. 2018-03-21T18:46:38.79 3.0 undecidable manual Sn -0.79 0
IV.MNTV.HNZ. 2018-03-21T18:46:27.97 3.0 undecidable manual Sn -0.06 0
CR.STON.BHZ. 2018-03-21T18:46:09.06 3.0 positive manual Pn 4.85 0
IV.RIBO.EHZ.01 2018-03-21T18:46:01.24 3.0 undecidable manual S 0.43 0
IV.APEC.HHZ. 2018-03-21T18:45:34.05 3.0 undecidable manual S -4.23 0
IV.GIGS.HHE. 2018-03-21T18:45:29.29 0.3 undecidable manual S 137 0.232 102 -0.4 67
IV.TERO.HHZ. 2018-03-21T18:45:27.88 0.3 undecidable manual S 90 0.1799 106 0.12 72
IV.GIGS.HHE. 2018-03-21T18:45:26.17 0.1 undecidable manual P 137 0.232 102 0.35 91
IV.MTRA.EHZ. 2018-03-21T18:45:26.13 0.3 undecidable manual S 12 0.1367 110 -0.02 74
IV.RM33.EHZ. 2018-03-21T18:45:25.81 3.0 undecidable manual P 0
IV.CAMP.HHE. 2018-03-21T18:45:24.96 0.6 undecidable manual S 157 0.0944 118 0.28 47
IV.TERO.HHZ. 2018-03-21T18:45:24.71 0.3 undecidable manual P 90 0.1799 106 -0.01 74
IV.T1299.EHZ. 2018-03-21T18:45:23.47 0.3 undecidable manual S 281 0.0576 131 -0.03 75
IV.MTRA.EHZ. 2018-03-21T18:45:23.63 0.6 undecidable manual P 12 0.1367 110 -0.16 48
OB.GAVE.EHZ. 2018-03-21T18:45:23.02 3.0 undecidable manual P 0.84 0
IV.T1299.EHZ. 2018-03-21T18:45:22.34 0.1 positive manual P 281 0.0576 131 0.09 99
IV.SMA1.EHE. 2018-03-21T18:45:22.67 0.6 undecidable manual S 293 0.0189 159 0.05 50
IV.CAMP.HHE. 2018-03-21T18:45:22.72 0.1 undecidable manual P 157 0.0944 118 -0.22 96
IV.SMA1.EHE. 2018-03-21T18:45:21.68 0.1 undecidable manual P 293 0.0189 159 -0.07 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.T1299.EHE. ML:1.1 0.0002205 0.56 AML other m 2018-03-21T18:45:24.54
IV.T1299.HNE. ML:0 0.00020175615 0.1792 AML other m 2018-03-21T18:45:23.53
IV.TERO.HNN. ML:1 8.2612E-5 1.6512 AML other m 2018-03-21T18:45:27.42
IV.TERO.HNE. ML:0.9 7.17636995E-5 1.6256 AML other m 2018-03-21T18:45:28.24
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