Earthquake with magnitude of Md 3.0 on date 20-03-2001 and time 21:00:00 (UTC) in region 1 km W Lariano (RM)

A magnitude Md 3.0 earthquake occured in region: 1 km W Lariano (RM), on

  • 20-03-2001 21:00:00 (UTC)
  • 20-03-2001 22:00:00 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 41.7320, 12.8160 at 3 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.

Municipalities within 20 km from the epicenter

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
Lariano RM 2 13432 13432
Velletri RM 6 53303 66735
Rocca Priora RM 8 11962 78697
Nemi RM 8 1943 80640
Artena RM 8 14276 94916
Labico RM 9 6379 101295
Rocca di Papa RM 10 17034 118329
Valmontone RM 10 15959 134288
San Cesareo RM 10 15153 149441
Rocca Massima LT 11 1136 150577
Genzano di Roma RM 11 23970 174547
Monte Compatri RM 11 11978 186525
Lanuvio RM 11 13632 200157
Ariccia RM 12 19407 219564
Zagarolo RM 12 17843 237407
Monte Porzio Catone RM 13 8693 246100
Colonna RM 13 4287 250387
Cori LT 13 11065 261452
Albano Laziale RM 13 41715 303167
Palestrina RM 14 21672 324839
Marino RM 14 43026 367865
Cave RM 14 11287 379152
Castel Gandolfo RM 14 8997 388149
Grottaferrata RM 14 20327 408476
Frascati RM 14 22087 430563
Castel San Pietro Romano RM 14 902 431465
Cisterna di Latina LT 15 36868 468333
Gallicano nel Lazio RM 16 6334 474667
Colleferro RM 16 21595 496262
Rocca di Cave RM 17 377 496639
Genazzano RM 17 6036 502675
Segni RM 18 9159 511834
Capranica Prenestina RM 19 351 512185
Poli RM 19 2418 514603
Ciampino RM 19 38412 553015

Municipalities with at least 50000 inhabitants

An earthquake occurred to
6 Km NE of Velletri (53303 inhabitants)
21 Km NE of Aprilia (73446 inhabitants)
26 Km S of Tivoli (56533 inhabitants)
27 Km E of Pomezia (62966 inhabitants)
30 Km N of Latina (125985 inhabitants)
31 Km S of Guidonia Montecelio (88673 inhabitants)
33 Km SE of Roma (2864731 inhabitants)
35 Km NE of Anzio (54211 inhabitants)
48 Km E of Fiumicino (78395 inhabitants)
84 Km SW of L'Aquila (69753 inhabitants)
93 Km S of Terni (111501 inhabitants)
94 Km E of Civitavecchia (52991 inhabitants)
96 Km SE of Viterbo (67173 inhabitants)
Recent and historical seismicity

These maps show the seismic activity in different time intervals, before the seismic event to which they refer. Data reported in the first two maps come from the analysis carried out in real time by the personnel of the INGV Operating Rooms, immediately after each earthquake. The third map shows data from 1985 to the date of the earthquake: the locations are reviewed by the seismological analysts of the INGV Italian Seismic Bulletin (Bollettino Sismico Italiano dell’INGV). The localization parameters (hypocentral coordinates and magnitude) are the best possible estimate with the data available to the INGV, but are constantly updated according to further data that become available. The location and magnitude parameters, subsequently reviewed by seismological analysts, may vary.

Earthquakes of the 3 days preceding this event

Earthquakes of the 3 days preceding this event

This map shows the earthquake epicenters with magnitude ≥ 0.0, localized with data recorded by the National Seismic Network and other collaborative networks both in Italy and in neighboring countries, in the 72 hours preceding this event. The size of the circle indicates the different classes of magnitude. The colors indicate the different time intervals preceding the seismic event. The black and white star is the epicenter of the current earthquake.
Earthquakes of the 90 days preceding this event

Earthquakes of the 90 days preceding this event

This map shows the earthquake epicenters with magnitude ≥ 2.0, localized with data recorded by the National Seismic Network and other collaborative networks both in Italy and in neighboring countries, in the 90 days preceding this event. The size of the circle indicates the different classes of magnitude. The colors indicate the different time intervals preceding the seismic event. The black and white star is the epicenter of the current earthquake.
Earthquakes from 1985 to the date of the event

Earthquakes from 1985 to the date of the event

This map shows the earthquake epicenters with magnitude ≥ 3.0, localized with data recorded by the National Seismic Network and other collaborative networks both in Italy and in neighboring countries, from 1985 to the date of this event. The size of the circle indicates the different classes of magnitude. The colors indicate the different time intervals preceding the seismic event. The black and white star is the epicenter of the current earthquake.
Earthquakes since 1000 AD until 2019

Earthquakes since 1000 AD until 2019

This map shows the epicenters of the historical earthquakes catalogue CPT15 (Catalogo Parametrico dei Terremoti Italiani, 2015 version 3.0, https://doi.org/10.13127/cpti/cpti15.3) since 1000 AD until 2019. The size of the square indicates the different classes of magnitude. For earthquakes with magnitude ≥ 6.0, it is also shown the year of occurrence and the magnitude value. The black and white star is the epicenter of the current earthquake.
Seismic hazard

Seismic hazard maps provide probabilistic estimates of the earthquake ground shaking exceeding a given threshold in a given geographic region within a given time window. Thus, it is not a deterministic prediction - a target that may be never reached given the complexity of the earthquake physical phenomenon - nor of the maximum expected earthquake since this has extremely low probabilities to occur.

In 2004, it was published the seismic hazard map of Italy (http://zonesismiche.mi.ingv.it) that provides a picture of the most hazardous geographic regions. The seismic hazard map of Italy (GdL MPS, 2004; rif. Ordinanza PCM del 28 aprile 2006, n. 3519, All. 1b) provides the 10% probability of exceedance in 50 years of the horizontal acceleration at rock sites (i.e., Vs30>800 m/s; cat. A, 3.2.1 of the D.M. 14.09.2005).

The colours indicate the various values of the ground acceleration that have 10% to be exceeded within 50 years. In general, the colours associated to low values of acceleration refer to areas that are less hazardous and stronger earthquakes repeat less frequently although they may still occur.

Seismic hazard map

Seismic hazard map

This map shows the seismic hazard map of Italy for the region where the earthquake occurred.
Shakemap
Felt maps
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Bulletin
Rev1000
Md 3.0
ML-VAX 2.0
2001-03-20
21:00:00
41.732 12.816 3 2013-07-15
08:40:51
Bollettino Sismico Italiano INGV 413879
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2001-03-20 21:00:00 ± 0.202
Latitude 41.7320 ± 0.0171
Longitude 12.8160 ± 0.0188
Depth (km) 3 ± 2 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 413879

Uncertainty

Field Value
Preferred uncertainty description horizontal uncertainty
Semi-major axis of confidence ellipse (meter)
Semi-minor axis of confidence ellipse (meter)
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi)
Circular confidence region, given by single value of horizontal uncertainty (meter) 2454.8
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 172
Number of associated phases, regardless of their use for origin computation 30
Number of defining phases 30
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.5
Epicentral distance of station closest to the epicenter (degree) 0.00065
Epicentral distance of station farthest from the epicenter (degree) 0.01757
Number of stations at which the event was observed 16
Number of stations from which data was used for origin computation 16
Magnitudes information

Md:3.0

Field Value
Value 3.0
Uncertainty
Num. used stations 5
Type of magnitude Md
Reference to an origin 413879
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 23:29:55

ML:2.0

Field Value
Value 2.0
Uncertainty
Num. used stations 8
Type of magnitude ML
Reference to an origin 413879
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2015-04-28 13:07:13
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
--.FB9.Z. 2001-03-20T21:00:59.59 10.0 undecidable manual SN 359 1.9536 0.08 0.5
--.SNTG.Z. 2001-03-20T21:00:49.18 10.0 undecidable manual SN 3 1.5207 0 0.6
--.ASS.Z. 2001-03-20T21:00:44.16 10.0 undecidable manual SN 354 1.332 -0.52 0.5
--.CPI2.Z. 2001-03-20T21:00:40.00 10.0 undecidable manual SN 96 1.1211 0.16 0.7
--.NRCA.Z. 2001-03-20T21:00:40.00 10.0 undecidable manual SN 11 1.11 0.38 0.6
--.CRVI.Z. 2001-03-20T21:00:39.34 10.0 undecidable manual SN 89 1.11 -0.02 0.7
--.RFI.Z. 2001-03-20T21:00:35.63 10.0 undecidable manual SG 115 0.9657 0.52 0.6
--.FB9.Z. 2001-03-20T21:00:34.84 10.0 undecidable manual PN 359 1.9536 0.23 1.2
--.ARV.Z. 2001-03-20T21:00:33.60 10.0 undecidable manual PN 2 1.7649 1.06 0.4
--.RVI2.Z. 2001-03-20T21:00:32.50 10.0 undecidable manual SG 96 0.8991 -0.38 0.7
--.SDI.Z. 2001-03-20T21:00:28.33 10.0 undecidable manual SG 91 0.7326 0.7 0.5
--.SNTG.Z. 2001-03-20T21:00:28.75 10.0 undecidable manual PN 3 1.5207 0.09 1.5
--.AQU.Z. 2001-03-20T21:00:27.87 10.0 undecidable manual SG 34 0.7548 -0.29 0.7
--.MNS.Z. 2001-03-20T21:00:25.45 10.0 undecidable manual SG 351 0.6549 0.45 0.6
--.ASS.Z. 2001-03-20T21:00:25.30 10.0 undecidable manual PN 354 1.332 -0.76 1
--.CPI2.Z. 2001-03-20T21:00:24.26 10.0 undecidable manual PN 96 1.1211 1 0.6
--.CRVI.Z. 2001-03-20T21:00:23.53 10.0 undecidable manual PN 89 1.11 0.55 1.2
--.NRCA.Z. 2001-03-20T21:00:21.67 10.0 undecidable manual PN 11 1.11 -1.46 0.2
--.PQ9.Z. 2001-03-20T21:00:21.81 10.0 undecidable manual SG 56 0.5217 1.23 0.2
--.RFI.Z. 2001-03-20T21:00:20.42 10.0 undecidable manual PG 115 0.9657 -0.11 1.9
--.RNI2.Z. 2001-03-20T21:00:20.83 10.0 undecidable manual PG 91 0.9879 -0.12 1.9
--.RVI2.Z. 2001-03-20T21:00:17.98 10.0 undecidable manual PG 96 0.8991 -1.27 0.4
--.AQU.Z. 2001-03-20T21:00:16.90 10.0 undecidable manual PG 34 0.7548 0.38 1.6
--.SDI.Z. 2001-03-20T21:00:15.44 10.0 undecidable manual PG 91 0.7326 -0.77 1.1
--.MNS.Z. 2001-03-20T21:00:13.65 10.0 undecidable manual PG 351 0.6549 -1.04 0.7
--.PQ9.Z. 2001-03-20T21:00:12.10 10.0 positive manual PG 56 0.5217 -0.04 3.9
--.MA9.Z. 2001-03-20T21:00:05.90 10.0 undecidable manual SG 287 0.1221 -0.38 0.7
--.RDP.Z. 2001-03-20T21:00:04.59 10.0 undecidable manual SG 289 0.0666 0.75 0.4
--.MA9.Z. 2001-03-20T21:00:02.75 10.0 undecidable manual PG 287 0.1221 -0.67 1.3
--.RDP.Z. 2001-03-20T21:00:02.90 10.0 positive manual PG 289 0.0666 0.42 3.1
TDMT - Time Domain Moment Tensor
Fault Plane solutions in the area
Fault Plane solutions

Fault Plane solutions

The map reports the fault plane solutions for earthquakes in the region from 1977 to the date of this event. Red moment tensors are determined using the Regional Centroid Moment Tensor technique (RCMT, http://www.bo.ingv.it/RCMT) applied for earthquakes with magnitude larger than 4.5 in the Euro-Mediterranenan area. Occasionally, when a station azimuthal coverage exists RCMTs can be obtained also for earthquakes with magnitude down to 4.0. The gray moment tensors are obtained with the Time Domain Moment Tensor method (TDMT, /tdmt). This technique is applied to earthquakes with magnitude ML greater than 3.2, when it is possible. The size of symbols scales with the calculated moment magnitude Mw.
Download
Type Description Link
QuakeML - small Event, Origin, FocalMechanism Download
QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download