Earthquake with magnitude of ML 1.6 on date 25-03-2020 and time 03:41:28 (Italy) in region 4 km SW Ariccia (RM)

A magnitude ML 1.6 earthquake occured in region: 4 km SW Ariccia (RM), on

  • 25-03-2020 02:41:28 (UTC)
  • 25-03-2020 03:41:28 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 41.7, 12.64 at 11 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
Ariccia RM 4 19407 19407
Albano Laziale RM 4 41715 61122
Genzano di Roma RM 5 23970 85092
Lanuvio RM 6 13632 98724
Castel Gandolfo RM 6 8997 107721
Nemi RM 7 1943 109664
Marino RM 8 43026 152690
Rocca di Papa RM 9 17034 169724
Grottaferrata RM 11 20327 190051
Aprilia LT 11 73446 263497
Velletri RM 12 53303 316800
Pomezia RM 12 62966 379766
Ardea RM 12 49183 428949
Ciampino RM 12 38412 467361
Frascati RM 13 22087 489448
Monte Porzio Catone RM 15 8693 498141
Monte Compatri RM 15 11978 510119
Rocca Priora RM 15 11962 522081
Lariano RM 17 13432 535513
Colonna RM 18 4287 539800
San Cesareo RM 19 15153 554953
Cisterna di Latina LT 19 36868 591821

Municipalities with at least 50000 inhabitants

An earthquake occurred to
11 Km N of Aprilia (73446 inhabitants)
12 Km W of Velletri (53303 inhabitants)
12 Km E of Pomezia (62966 inhabitants)
26 Km SE of Roma (2864731 inhabitants)
28 Km N of Anzio (54211 inhabitants)
33 Km SW of Tivoli (56533 inhabitants)
34 Km NW of Latina (125985 inhabitants)
34 Km E of Fiumicino (78395 inhabitants)
35 Km S of Guidonia Montecelio (88673 inhabitants)
83 Km SE of Civitavecchia (52991 inhabitants)
92 Km SE of Viterbo (67173 inhabitants)
96 Km SW of L'Aquila (69753 inhabitants)
96 Km S of Terni (111501 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
Reviewed
Rev100
ML 1.6 2020-03-25
02:41:28
41.7 12.64 11 2020-03-25
02:45:55
Sala Sismica INGV-Roma 77546971
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-03-25 02:41:28 ± 0.23
Latitude 41.70 ± 0.01
Longitude 12.64 ± 0.01
Depth (km) 11 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 77546971

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1054
Semi-minor axis of confidence ellipse (meter) 363
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 42
Circular confidence region, given by single value of horizontal uncertainty (meter) 1050
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 225
Number of associated phases, regardless of their use for origin computation 11
Number of defining phases 11
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.19
Epicentral distance of station closest to the epicenter (degree) 0.04766
Epicentral distance of station farthest from the epicenter (degree) 0.35883
Number of stations at which the event was observed 6
Number of stations from which data was used for origin computation 6
Magnitude information

ML:1.6

Field Value
Value 1.6
Uncertainty 0.2
Num. used stations 8
Type of magnitude ML
Reference to an origin 77546971
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-03-25 02:45:55
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.CERT.HHZ. 2020-03-25T02:41:36.32 1.0 undecidable manual P 45 0.3588 50 -0.01 24
IV.VIVA.HHZ. 2020-03-25T02:41:34.08 0.6 undecidable manual S 61 0.1115 131 -0.36 47
IV.RMP.HHZ. 2020-03-25T02:41:34.80 0.6 undecidable manual S 23 0.1259 128 -0.06 50
IV.LAV9.HHZ. 2020-03-25T02:41:33.17 0.6 undecidable manual S 112 0.0477 154 0.25 49
IV.SAMA.EHZ. 2020-03-25T02:41:33.89 0.6 undecidable manual S 337 0.0917 137 0.01 51
IV.RDP.HHZ. 2020-03-25T02:41:33.72 0.6 undecidable manual S 39 0.0827 139 0.05 51
IV.VIVA.HHZ. 2020-03-25T02:41:32.21 0.6 positive manual P 61 0.1115 131 0.18 49
IV.RMP.HHZ. 2020-03-25T02:41:32.37 0.1 negative manual P 23 0.1259 128 0.1 100
IV.SAMA.EHZ. 2020-03-25T02:41:31.60 0.1 undecidable manual P 337 0.0917 137 -0.11 100
IV.RDP.HHZ. 2020-03-25T02:41:31.82 0.3 positive manual P 39 0.0827 139 0.23 73
IV.LAV9.HHZ. 2020-03-25T02:41:30.72 0.6 undecidable manual P 112 0.0477 154 -0.43 47
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.RDP.HHN. ML:1.4 0.0003295 0.58 AML other m 2020-03-25T02:41:33.09
IV.RDP.HHE. ML:1.3 0.0002465 0.38 AML other m 2020-03-25T02:41:33.82
IV.LAV9.HHN. ML:1.6 0.000619 1.02 AML other m 2020-03-25T02:41:33.39
IV.LAV9.HHE. ML:1.7 0.000727 0.54 AML other m 2020-03-25T02:41:34.86
IV.RMP.HHE. ML:1.7 0.0005105 1.22 AML other m 2020-03-25T02:41:34.97
IV.RMP.HHN. ML:1.8 0.000712 1.64 AML other m 2020-03-25T02:41:35.06
IV.VIVA.HHE. ML:1.5 0.000336 0.18 AML other m 2020-03-25T02:41:35.15
IV.VIVA.HHN. ML:1.6 0.000377 0.22 AML other m 2020-03-25T02:41:35.55
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