Earthquake with magnitude of Md 2.0 on date 20-05-1987 and time 10:24:13 (Italy) in region 4 km E Nemi (RM)

A magnitude Md 2.0 earthquake occured in region: 4 km E Nemi (RM), on

  • 20-05-1987 08:24:13 (UTC)
  • 20-05-1987 10:24:13 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 41.74, 12.76 at 6 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
Nemi RM 4 1943 1943
Rocca di Papa RM 5 17034 18977
Velletri RM 6 53303 72280
Genzano di Roma RM 6 23970 96250
Lariano RM 6 13432 109682
Rocca Priora RM 7 11962 121644
Ariccia RM 7 19407 141051
Lanuvio RM 8 13632 154683
Albano Laziale RM 8 41715 196398
Monte Compatri RM 8 11978 208376
Castel Gandolfo RM 9 8997 217373
Marino RM 9 43026 260399
Monte Porzio Catone RM 9 8693 269092
Grottaferrata RM 9 20327 289419
Frascati RM 10 22087 311506
San Cesareo RM 10 15153 326659
Colonna RM 11 4287 330946
Labico RM 12 6379 337325
Zagarolo RM 13 17843 355168
Artena RM 13 14276 369444
Valmontone RM 14 15959 385403
Ciampino RM 15 38412 423815
Rocca Massima LT 15 1136 424951
Gallicano nel Lazio RM 16 6334 431285
Palestrina RM 16 21672 452957
Cori LT 17 11065 464022
Castel San Pietro Romano RM 17 902 464924
Cisterna di Latina LT 17 36868 501792
Cave RM 17 11287 513079
Aprilia LT 18 73446 586525
Rocca di Cave RM 20 377 586902

Municipalities with at least 50000 inhabitants

An earthquake occurred to
6 Km NW of Velletri (53303 inhabitants)
18 Km NE of Aprilia (73446 inhabitants)
22 Km E of Pomezia (62966 inhabitants)
26 Km S of Tivoli (56533 inhabitants)
29 Km SE of Roma (2864731 inhabitants)
30 Km S of Guidonia Montecelio (88673 inhabitants)
32 Km NW of Latina (125985 inhabitants)
34 Km NE of Anzio (54211 inhabitants)
43 Km E of Fiumicino (78395 inhabitants)
87 Km SW of L'Aquila (69753 inhabitants)
89 Km E of Civitavecchia (52991 inhabitants)
92 Km S of Terni (111501 inhabitants)
93 Km SE 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 Md 2.0 1987-05-20
08:24:13
41.74 12.76 6 2013-07-15
08:40:51
Bollettino Sismico Italiano INGV 47429
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1987-05-20 08:24:13 ± 0.141
Latitude 41.74 ± 0.01
Longitude 12.76 ± 0.01
Depth (km) 6 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 47429

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) 777.6
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 255
Number of associated phases, regardless of their use for origin computation 6
Number of defining phases 6
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.1
Epicentral distance of station closest to the epicenter (degree) 0.00032
Epicentral distance of station farthest from the epicenter (degree) 0.0017
Number of stations at which the event was observed 3
Number of stations from which data was used for origin computation 3
Magnitude information

Md:2

Field Value
Value 2
Uncertainty
Num. used stations 3
Type of magnitude Md
Reference to an origin 47429
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 17:46:29
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
--.CP9.Z. 1987-05-20T08:24:21.50 10.0 undecidable manual SG 49 0.0017 0.15 0.2
--.CP9.Z. 1987-05-20T08:24:18.00 10.0 undecidable manual PG 49 0.0017 -0.1 0.8
--.RMP.Z. 1987-05-20T08:24:17.50 10.0 undecidable manual SG 331 0.0007 -0.07 0.9
--.RMP.Z. 1987-05-20T08:24:16.00 10.0 undecidable manual PG 331 0.0007 0.08 1.5
--.RDP.Z. 1987-05-20T08:24:16.20 10.0 undecidable manual SG 304 0.0003 -0.06 0.7
--.RDP.Z. 1987-05-20T08:24:15.20 10.0 undecidable manual PG 304 0.0003 0.04 1.9
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
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